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DR ANTHONY MELVIN CRASTO, Born in Mumbai in 1964 and graduated from Mumbai University, Completed his Ph.D from ICT, 1991,Matunga, Mumbai, India, in Organic Chemistry, The thesis topic was Synthesis of Novel Pyrethroid Analogues, Currently he is working with AFRICURE PHARMA, ROW2TECH, CLEANCHEM LABS as ADVISOR, earlier assignment was with GLENMARK LIFE SCIENCES LTD, as CONSUlTANT, Retired from GLENMARK in Jan2022 Research Centre as Principal Scientist, Process Research (bulk actives) at Mahape, Navi Mumbai, India. Total Industry exp 32 plus yrs, Prior to joining Glenmark, he has worked with major multinationals like Hoechst Marion Roussel, now Sanofi, Searle India Ltd, now RPG lifesciences, etc. He has worked with notable scientists like Dr K Nagarajan, Dr Ralph Stapel, Prof S Seshadri, etc, He did custom synthesis for major multinationals in his career like BASF, Novartis, Sanofi, etc., He has worked in Discovery, Natural products, Bulk drugs, Generics, Intermediates, Fine chemicals, Neutraceuticals, GMP, Scaleups, etc, he is now helping millions, has 9 million plus hits on Google on all Organic chemistry websites. His friends call him Open superstar worlddrugtracker. His New Drug Approvals, Green Chemistry International, All about drugs, Eurekamoments, Organic spectroscopy international, etc in organic chemistry are some most read blogs He has hands on experience in initiation and developing novel routes for drug molecules and implementation them on commercial scale over a 32 PLUS year tenure till date Feb 2023, Around 35 plus products in his career. He has good knowledge of IPM, GMP, Regulatory aspects, he has several International patents published worldwide . He has good proficiency in Technology transfer, Spectroscopy, Stereochemistry, Synthesis, Polymorphism etc., He suffered a paralytic stroke/ Acute Transverse mylitis in Dec 2007 and is 90 %Paralysed, He is bound to a wheelchair, this seems to have injected feul in him to help chemists all around the world, he is more active than before and is pushing boundaries, He has 100 million plus hits on Google, 2.5 lakh plus connections on all networking sites, 100 Lakh plus views on dozen plus blogs, 227 countries, 7 continents, He makes himself available to all, contact him on +91 9323115463, email, Twitter, @amcrasto , He lives and will die for his family, 90% paralysis cannot kill his soul., Notably he has 38 lakh plus views on New Drug Approvals Blog in 227 countries...... , He appreciates the help he gets from one and all, Friends, Family, Glenmark, Readers, Wellwishers, Doctors, Drug authorities, His Contacts, Physiotherapist, etc He has total of 32 International and Indian awards

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ChemSpider 2D Image | Setmelanotide | C49H68N18O9S2
SVG Image



  • Molecular FormulaC49H68N18O9S2
  • Average mass1117.309 Da
  • N-acetyl-L-arginyl-L-cysteinyl-D-alanyl-L-histidyl-D-phenylalanyl-L-arginyl-L-tryptophyl-L-cysteinamide (2->8)-disulfide

1,2-Dithia-5,8,11,14,17,20-hexaazacyclotricosane-4-carboxamide, 22-[[(2S)-2-(acetylamino)-5-[(diaminomethylene)amino]-1-oxopentyl]amino]-10-[3-[(diaminomethylene)amino]propyl]-16-(1H-imidazol-5-ylmeth yl)-7-(1H-indol-3-ylmethyl)-19-methyl-6,9,12,15,18,21-hexaoxo-13-(phenylmethyl)-, (4R,7S,10S,13R,16S,19R,22R)- [ACD/Index Name]10011920014-72-8[RN]Imcivree [Trade name]N2-acetyl-L-arginyl-L-cysteinyl-D-alanyl-L-histidyl-D-phenylalanyl-L-arginyl-Ltryptophyl- L-cysteinamide, cyclic (2-8)-disulfideN7T15V1FUYRM-493, BIM-22493UNII-N7T15V1FUYсетмеланотид [Russian] [INN]سيتميلانوتيد [Arabic] [INN]司美诺肽 [Chinese] [INN](4R,7S,10S,13R,16S,19R,22R)-22-[[(2S)-2-acetamido-5-(diaminomethylideneamino)pentanoyl]amino]-13-benzyl-10-[3-(diaminomethylideneamino)propyl]-16-(1H-imidazol-5-ylmethyl)-7-(1H-indol-3-ylmethyl)-19-methyl-6,9,12,15,18,21-hexaoxo-1,2-dithia-5,8,11,14,17,20-hexazacyclotricosane-4-carboxamide

FDA 11/25/2020, Imcivree, To treat obesity and the control of hunger associated with pro-opiomelanocortin deficiency, a rare disorder that causes severe obesity that begins at an early age
Drug Trials Snapshot, 10MG/ML, SOLUTION;SUBCUTANEOUS, Orphan

Rhythm Pharmaceuticals Announces FDA Approval of IMCIVREE™ (setmelanotide) as First-ever Therapy for Chronic Weight Management in Patients with Obesity Due to POMC, PCSK1 or LEPR Deficiency Nasdaq:RYTM

update Imcivree EMA APPROVED 2021/7/16


IMCIVREE contains setmelanotide acetate, a melanocortin 4 (MC4) receptor agonist. Setmelanotide is an 8 amino acid cyclic peptide analog of endogenous melanocortin peptide α-MSH (alpha-melanocyte stimulating hormone).

The chemical name for setmelanotide acetate is acetyl-L-arginyl-L-cysteinyl-D-alanyl-Lhistidinyl-D-phenylalanyl-L-arginyl-L-tryptophanyl-L-cysteinamide cyclic (2→8)-disulfide acetate. Its molecular formula is C49H68N18O9S2 (anhydrous, free-base), and molecular mass is 1117.3 Daltons (anhydrous, free-base).

The chemical structure of setmelanotide is:

IMCIVREE (setmelanotide) Structrual Formula Illustration

IMCIVREE injection is a sterile clear to slightly opalescent, colorless to slightly yellow solution. Each 1 mL of IMCIVREE contains 10 mg of setmelanotide provided as setmelanotide acetate, which is a salt with 2 to 4 molar equivalents of acetate, and the following inactive ingredients: 100 mg N-(carbonyl-methoxypolyethylene glycol 2000)-1,2-distearoyl-glycero-3phosphoethanolamine sodium salt, 8 mg carboxymethylcellulose sodium (average MWt 90,500), 11 mg mannitol, 5 mg phenol, 10 mg benzyl alcohol, 1 mg edetate disodium dihydrate, and Water for Injection. The pH of IMCIVREE is 5 to 6.

Setmelanotide is a peptide drug and investigational anti-obesity medication which acts as a selective agonist of the MC4 receptor. Setmelanotide binds to and activates MC4 receptors in the paraventricular nucleus (PVN) of the hypothalamus and in the lateral hypothalamic area (LHA), areas involved in the regulation of appetite, and this action is thought to underlie its appetite suppressant effects. Setmelanotide increases resting energy expenditure in both obese animals and humans. Setmelanotide has been reported to possess the following activity profile (cAMP, EC50): MC4 (0.27 nM) > MC3 (5.3 nM) ≈ MC1 (5.8 nM) > MC5 (1600 nM) ≟ MC2 (>1000 nM).

Setmelanotide, sold under the brand name Imcivree, is a medication for the treatment of obesity.[1]

The most common side effects include injection site reactions, skin hyperpigmentation (skin patches that are darker than surrounding skin), headache and gastrointestinal side effects (such as nausea, diarrhea, and abdominal pain), among others.[1] Spontaneous penile erections in males and adverse sexual reactions in females have occurred with treatment.[1] Depression and suicidal ideation have also occurred with setmelanotide.[1]


WO 2011060355

Medical uses

Setmelanotide is indicated for chronic weight management (weight loss and weight maintenance for at least one year) in people six years and older with obesity due to three rare genetic conditions: pro-opiomelanocortin (POMC) deficiency, proprotein subtilisin/kexin type 1 (PCSK1) deficiency, and leptin receptor (LEPR) deficiency confirmed by genetic testing demonstrating variants in POMC, PCSK1, or LEPR genes considered pathogenic (causing disease), likely pathogenic, or of uncertain significance.[1] Setmelanotide is the first FDA-approved treatment for these genetic conditions.[1]

Setmelanotide is not approved for obesity due to suspected POMC, PCSK1, or LEPR deficiency with variants classified as benign (not causing disease) or likely benign or other types of obesity, including obesity associated with other genetic syndromes and general (polygenic) obesity.[1]

Setmelanotide binds to and activates MC4 receptors in the paraventricular nucleus (PVN) of the hypothalamus and in the lateral hypothalamic area (LHA), areas involved in the regulation of appetite, and this action is thought to underlie its appetite suppressant effects.[2] In addition to reducing appetite, setmelanotide increases resting energy expenditure in both obese animals and humans.[3] Importantly, unlike certain other MC4 receptor agonists, such as LY-2112688, setmelanotide has not been found to produce increases in heart rate or blood pressure.[4]

Setmelanotide has been reported to possess the following activity profile (cAMPEC50): MC4 (0.27 nM) > MC3 (5.3 nM) ≈ MC1 (5.8 nM) > MC5 (1600 nM) ≟ MC2 (>1000 nM).[5] (19.6-fold selectivity for MC4 over MC3, the second target of highest activity.)


Setmelanotide was evaluated in two one-year studies.[1] The first study enrolled participants with obesity and confirmed or suspected POMC or PCSK1 deficiency while the second study enrolled participants with obesity and confirmed or suspected LEPR deficiency; all participants were six years or older.[1] The effectiveness of setmelanotide was determined by the number of participants who lost more than ten percent of their body weight after a year of treatment.[1]

The effectiveness of setmelanotide was assessed in 21 participants, ten in the first study and eleven in the second.[1] In the first study, 80 percent of participants with POMC or PCSK1 deficiency lost ten percent or more of their body weight.[1] In the second study, 46 percent of participants with LEPR deficiency lost ten percent or more of their body weight.[1]

The study also assessed the maximal (greatest) hunger in sixteen participants over the previous 24 hours using an eleven-point scale in participants twelve years and older.[1] In both studies, some, but not all, of participants’ weekly average maximal hunger scores decreased substantially from their scores at the beginning of the study.[1] The degree of change was highly variable among participants.[1]

The U.S. Food and Drug Administration (FDA) granted the application for setmelanotide orphan disease designation, breakthrough therapy designation, and priority review.[1] The FDA granted the approval of Imcivree to Rhythm Pharmaceutical, Inc.[1]


Setmelanotide is a peptide drug and investigational anti-obesity medication which acts as a selective agonist of the MC4 receptor.[6][4] Its peptide sequence is Ac-Arg-Cys(1)-D-Ala-His-D-Phe-Arg-Trp-Cys(1)-NH2. It was first discovered at Ipsen and is being developed by Rhythm Pharmaceuticals for the treatment of obesity and diabetes.[6] In addition, Rhythm Pharmaceuticals is conducting trials of setmelanotide for the treatment of Prader–Willi syndrome (PWS), a genetic disorder which includes MC4 receptor deficiency and associated symptoms such as excessive appetite and obesity.[7] As of December 2014, the drug is in phase II clinical trials for obesity and PWS.[6][8][9][needs update] So far, preliminary data has shown no benefit of Setmelanotide in Prader-Willi syndrome.[10]


WO 2007008704

WO 2011060355

WO 2011060352

US 20120225816


Journal of Medicinal Chemistry, 61(8), 3674-3684; 2018


Synthesis of Example 1i.e., Ac-Arg-cyclo(Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-NH2

Figure US09314509-20160419-C00004

The title peptide having the above structure was assembled using Fmoc chemistry on an Apex peptide synthesizer (Aapptec; Louisville, Ky., USA). 220 mg of 0.91 mmol/g (0.20 mmoles) Rink Amide MBHA resin (Polymer Laboratories; Amherst, Mass., USA) was placed in a reaction well and pre-swollen in 3.0 mL of DMF prior to synthesis. For cycle 1, the resin was treated with two 3-mL portions of 25% piperidine in DMF for 5 and 10 minutes respectively, followed by 4 washes of 3-mL DMF—each wash consisting of adding 3 mL of solvent, mixing for 1 minute, and emptying for 1 minute. Amino acids stocks were prepared in NMP as 0.45M solutions containing 0.45M HOBT. HBTU was prepared as a 0.45M solution in NMP and DIPEA was prepared as a 2.73M solution in NMP. To the resin, 2 mL of the first amino acid (0 9 mmoles, Fmoc-Cys(Trt)-OH) (Novabiochem; San Diego, Calif., USA) was added along with 2 mL (0.9 mmoles) of HBTU and 1.5 mL (4.1 mmoles) of DIPEA. After one hour of constant mixing, the coupling reagents were drained from the resin and the coupling step was repeated. Following amino acid acylation, the resin was washed with two 3-mL aliquots of DMF for 1 minute. The process of assembling the peptide (deblock/wash/acylate/wash) was repeated for cycles 2-9 identical to that as described for cycle 1. The following amino acids were used: cycle 2) Fmoc-Trp(Boc)-OH (Genzyme; Cambridge, Mass., USA); cycle 3) Fmoc-Arg(Pbf)-OH (Novabiochem); cycle 4) Fmoc-DPhe-OH (Genzyme); cycle 5) Fmoc-His(Trt)-OH (Novabiochem); cycle 6) Fmoc-D-Ala-OH (Genzyme); cycle 7) Fmoc-Cys(Trt)-OH, (Novabiochem); and cycle 8) Fmoc-Arg(Pbf)-OH (Genzyme). The N-terminal Fmoc was removed with 25% piperidine in DMF as described above, followed by four 3-mL DMF washes for 1 minute. Acetylation of the N-terminus was performed by adding 0.5 mL of 3M DIPEA in NMP to the resin along with 1.45 mL of 0.45M acetic anhydride in NMP. The resin was mixed for 30 minutes and acetylation was repeated. The resin was washed with 3 mL of DMF for a total of 5 times followed with 5 washes with 5 mL of DCM each.

To cleave and deprotect the peptide, 5mL of the following reagent was added to the resin: 2% TIS/5% water/5% (w/v) DTT/88% TFA. The solution was allowed to mix for 3.5 hours. The filtrate was collected into 40 mL of cold anhydrous ethyl ether. The precipitate was pelleted for 10 minutes at 3500 rpm in a refrigerated centrifuge. The ether was decanted and the peptide was re-suspended in fresh ether. The ether workup was performed three times. Following the last ether wash, the peptide was allowed to air dry to remove residual ether.

The peptide was dissolved in 10% acetonitrile and analyzed by mass spectrometry and reverse-phase HPLC employing a 30×4.6 cm C18 column (Vydac; Hesperia, Calif., USA) with a gradient of 2-60% acetonitrile (0.1% TFA) over 30 minutes. This analysis identified a product with ˜53% purity. Mass analysis employing electrospray ionization identified a main product containing a mass of 1118.4 corresponding to the desired linear product. The crude product (˜100 mg) was diluted to a concentration of 2 mg/mL in 5% acetic acid. To this solution, 0.5M iodine/methanol was added dropwise with vigorous stirring until a pale yellow color was achieved. The solution was vigorously stirred for another 10 minutes. Excess iodine was then quenched by adding 1.0M sodium thiosulfate under continuous mixing until the mixture was rendered colorless. The peptide was re-examined by mass spectrometry analysis and HPLC. Mass spectrometry analysis identified a main species with a mass of 1116.4 which indicated successful oxidation to form the cyclic peptide. The peptide solution was purified on a preparative HPLC equipped with a C18 column using a similar elution gradient. The purified product was re-analyzed by HPLC for purity (>95%) and mass spectrometry (1116.9 which is in agreement with the expected mass of 1117.3) and subsequently lyophilized. Following lyophilization, 28 mg of purified product was obtained representing a 24% yield.

The other exemplified peptides were synthesized substantially according to the procedure described for the above-described synthetic process. Physical data for select exemplified peptides are given in Table 1.

TABLE 1 Example Mol. Wt. Mol. Wt. Purity Number (calculated) (ES-MS) (HPLC) 1 1117.3 1116.9 95.1% 2 1117.3 1116.8 99.2% 3 1280.5 1280.6 98.0% 5 1216.37 1216.20 99.9%

Preparation of Pamoate Salt of Example 1

The acetate salt of Example 1 (200 mg, 0.18 mmole) was dissolved in 10 mL of water. Sodium pamoate (155 mg, 0.36 mmole) was dissolved in 10 mL of water. The two solutions were combined and mixed well. The precipitates were collected by centrifugation at 3000 rpm for 20 minutes, washed for three times with water, and dried by lyophilization.


  1. Jump up to:a b c d e f g h i j k l m n o p q r “FDA approves first treatment for weight management for people with certain rare genetic conditions”U.S. Food and Drug Administration (FDA) (Press release). 27 November 2020. Retrieved 27 November 2020.  This article incorporates text from this source, which is in the public domain.
  2. ^ Kim GW, Lin JE, Blomain ES, Waldman SA (January 2014). “Antiobesity pharmacotherapy: new drugs and emerging targets”Clinical Pharmacology and Therapeutics95 (1): 53–66. doi:10.1038/clpt.2013.204PMC 4054704PMID 24105257.
  3. ^ Chen KY, Muniyappa R, Abel BS, Mullins KP, Staker P, Brychta RJ, et al. (April 2015). “RM-493, a melanocortin-4 receptor (MC4R) agonist, increases resting energy expenditure in obese individuals”The Journal of Clinical Endocrinology and Metabolism100 (4): 1639–45. doi:10.1210/jc.2014-4024PMC 4399297PMID 25675384.
  4. Jump up to:a b Kievit P, Halem H, Marks DL, Dong JZ, Glavas MM, Sinnayah P, et al. (February 2013). “Chronic treatment with a melanocortin-4 receptor agonist causes weight loss, reduces insulin resistance, and improves cardiovascular function in diet-induced obese rhesus macaques”Diabetes62 (2): 490–7. doi:10.2337/db12-0598PMC 3554387PMID 23048186.
  5. ^ Muniyappa R, Chen K, Brychta R, Abel B, Mullins K, Staker P, et al. (June 2014). “A Randomized, Double-Blind, Placebo-Controlled, Crossover Study to Evaluate the Effect of a Melanocortin Receptor 4 (MC4R) Agonist, RM-493, on Resting Energy Expenditure (REE) in Obese Subjects” (PDF). Endocrine Reviews. Rhythm Pharmaceuticals. 35 (3). Retrieved 2015-05-21.
  6. Jump up to:a b c Lee EC, Carpino PA (2015). “Melanocortin-4 receptor modulators for the treatment of obesity: a patent analysis (2008-2014)”. Pharmaceutical Patent Analyst4 (2): 95–107. doi:10.4155/ppa.15.1PMID 25853469.
  7. ^ “Obesity and Diabetes Caused by Genetic Deficiencies in the MC4 Pathway”. Rhythm Pharmaceuticals. Retrieved 2015-05-21.
  8. ^ Jackson VM, Price DA, Carpino PA (August 2014). “Investigational drugs in Phase II clinical trials for the treatment of obesity: implications for future development of novel therapies”. Expert Opinion on Investigational Drugs23 (8): 1055–66. doi:10.1517/13543784.2014.918952PMID 25000213S2CID 23198484.
  9. ^ “RM-493: A First-in-Class, Phase 2-Ready MC4 Agonist: A New Drug Class for the Treatment of Obesity and Diabetes”. Rhythm Pharmaceuticals. Archived from the original on 2015-06-14. Retrieved 2015-05-21.
  10. ^ Duis J, van Wattum PJ, Scheimann A, Salehi P, Brokamp E, Fairbrother L, et al. (March 2019). “A multidisciplinary approach to the clinical management of Prader-Willi syndrome”Molecular Genetics & Genomic Medicine7 (3): e514. doi:10.1002/mgg3.514PMC 6418440PMID 30697974.


The peptide sequence is Ac-Arg-Cys(1)-D-Ala-His-D-Phe-Arg-Trp-Cys(1)-NH2. It is being researched by Rhythm Pharmaceuticals for the treatment of obesity and diabetes. In addition, Rhythm Pharmaceuticals is conducting trials of setmelanotide for the treatment of Prader–Willi syndrome (PWS), a genetic disorder which includes MC4 receptor deficiency and associated symptoms such as excessive appetite and obesity. As of December 2014, the drug is in phase II clinical trials for obesity and PWS.

L-Cysteinamide, N2-acetyl-L-arginyl-L-cysteinyl-D-alanyl-L-histidyl-D-phenylalanyl-L-arginyl-L-tryptophyl-, cyclic (2->8)-disulfide


1: Lee EC, Carpino PA. Melanocortin-4 receptor modulators for the treatment of obesity: a patent analysis (2008-2014). Pharm Pat Anal. 2015;4(2):95-107. doi: 10.4155/ppa.15.1. PubMed PMID: 25853469.

2: Chen KY, Muniyappa R, Abel BS, Mullins KP, Staker P, Brychta RJ, Zhao X, Ring M, Psota TL, Cone RD, Panaro BL, Gottesdiener KM, Van der Ploeg LH, Reitman ML, Skarulis MC. RM-493, a melanocortin-4 receptor (MC4R) agonist, increases resting energy expenditure in obese individuals. J Clin Endocrinol Metab. 2015 Apr;100(4):1639-45. doi: 10.1210/jc.2014-4024. Epub 2015 Feb 12. PubMed PMID: 25675384; PubMed Central PMCID: PMC4399297.

3: Clemmensen C, Finan B, Fischer K, Tom RZ, Legutko B, Sehrer L, Heine D, Grassl N, Meyer CW, Henderson B, Hofmann SM, Tschöp MH, Van der Ploeg LH, Müller TD. Dual melanocortin-4 receptor and GLP-1 receptor agonism amplifies metabolic benefits in diet-induced obese mice. EMBO Mol Med. 2015 Feb 4;7(3):288-98. doi: 10.15252/emmm.201404508. PubMed PMID: 25652173; PubMed Central PMCID: PMC4364946.

4: Jackson VM, Price DA, Carpino PA. Investigational drugs in Phase II clinical trials for the treatment of obesity: implications for future development of novel therapies. Expert Opin Investig Drugs. 2014 Aug;23(8):1055-66. doi: 10.1517/13543784.2014.918952. Epub 2014 Jul 7. Review. PubMed PMID: 25000213.

5: Kievit P, Halem H, Marks DL, Dong JZ, Glavas MM, Sinnayah P, Pranger L, Cowley MA, Grove KL, Culler MD. Chronic treatment with a melanocortin-4 receptor agonist causes weight loss, reduces insulin resistance, and improves cardiovascular function in diet-induced obese rhesus macaques. Diabetes. 2013 Feb;62(2):490-7. doi: 10.2337/db12-0598. Epub 2012 Oct 9. PubMed PMID: 23048186; PubMed Central PMCID: PMC3554387.

6: Kumar KG, Sutton GM, Dong JZ, Roubert P, Plas P, Halem HA, Culler MD, Yang H, Dixit VD, Butler AA. Analysis of the therapeutic functions of novel melanocortin receptor agonists in MC3R- and MC4R-deficient C57BL/6J mice. Peptides. 2009 Oct;30(10):1892-900. doi: 10.1016/j.peptides.2009.07.012. Epub 2009 Jul 29. PubMed PMID: 19646498; PubMed Central PMCID: PMC2755620.

External links

Clinical data
Trade namesImcivree
Other namesRM-493; BIM-22493; IRC-022493; N2-Acetyl-L-arginyl-L-cysteinyl-D-alanyl-L-histidyl-D-phenylalanyl-L-arginyl-L-tryptophyl-L-cysteinamide, cyclic (2-8)-disulfide
ATC codeNone
Legal status
Legal statusUS: ℞-only
IUPAC name[show]
CAS Number920014-72-8
PubChem CID11993702
Chemical and physical data
Molar mass1117.32 g·mol−1
3D model (JSmol)Interactive image

///////////Setmelanotide, FDA 2020, 2020 APPROVALS, Imcivree, Orphan, PEPTIDE, ANTIOBESITY, UNII-N7T15V1FUY, сетмеланотид , سيتميلانوتيد , 司美诺肽 , BIM 22493, RM 493


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