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Systematic (IUPAC) name
N-{5-[5-(2,4-dioxo-1,3,8-triazaspiro[4.5]dec-8-yl)pentanoyl] -2,4-dimethoxyphenyl}-4-(trifluoromethyl)benzenesulfonamide
CAS Number 185376-97-0
PubChem CID 3693566
Synonyms RS-102,221; 8-[5-(2,4-Dimethoxy-5-(4-trifluoromethylphenylsulphonamido)phenyl -5-oxopentyl]-1,3,8-triazaspiro[4.5]decane-2,4-dione
Chemical data
Formula C27H33F3N4O7S
Molar mass 614.632 g/mol[[Script error: No such module "String".]]
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RS-102,221 is a drug developed by Hoffmann–La Roche, which was one of the first compounds discovered that acts as a potent and selective antagonist at the serotonin 5-HT2C receptor, with around 100x selectivity over the closely related 5-HT2A and 5-HT2B receptors.[1] It has anxiolytic effects in animal studies,[2] increases the effectiveness of SSRI antidepressants,[3] and shows a complex interaction with cocaine, increasing some effects but decreasing others, reflecting a role for the 5-HT2C receptor in regulation of the dopamine signalling system in the brain.[4][5][6][7]


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  1. Bonhaus DW, Weinhardt KK, Taylor M, DeSouza A, McNeeley PM, Szczepanski K, Fontana DJ, Trinh J, Rocha CL, Dawson MW, Flippin LA, Eglen RM. RS-102221: a novel high affinity and selective, 5-HT2C receptor antagonist. Neuropharmacology. 1997 Apr-May;36(4-5):621-9. PMID 9225287
  2. Kuznetsova EG, Amstislavskaya TG, Shefer EA, Popova NK. Effect of 5-HT2C receptor antagonist RS 102221 on mouse behavior. Bulletin of Experimental Biology and Medicine. 2006 Jul;142(1):76-9. PMID 17369908
  3. Cremers TI, Giorgetti M, Bosker FJ, Hogg S, Arnt J, Mørk A, Honig G, Bøgesø KP, Westerink BH, den Boer H, Wikstrom HV, Tecott LH. Inactivation of 5-HT(2C) receptors potentiates consequences of serotonin reuptake blockade. Neuropsychopharmacology. 2004 Oct;29(10):1782-9. PMID 15138437
  4. Filip M, Cunningham KA. Serotonin 5-HT(2C) receptors in nucleus accumbens regulate expression of the hyperlocomotive and discriminative stimulus effects of cocaine. Pharmacology, Biochemistry and Behaviour. 2002 Apr;71(4):745-56. PMID 11888566
  5. Filip M, Cunningham KA. Hyperlocomotive and discriminative stimulus effects of cocaine are under the control of serotonin(2C) (5-HT(2C)) receptors in rat prefrontal cortex. Journal of Pharmacology and Experimental Therapeutics. 2003 Aug;306(2):734-43. PMID 12721337
  6. Morita K, Hamamoto M, Arai S, Kitayama S, Irifune M, Kawahara M, Kihira K, Dohi T. Inhibition of serotonin transporters by cocaine and meprylcaine through 5-TH2C receptor stimulation facilitates their seizure activities. Brain Research. 2005 Sep 28;1057(1-2):153-60. PMID 16125150
  7. Dremencov E, Weizmann Y, Kinor N, Gispan-Herman I, Yadid G. Modulation of dopamine transmission by 5HT2C and 5HT3 receptors: a role in the antidepressant response. Current Drug Targets. 2006 Feb;7(2):165-75. PMID 16475958