ar-a000002 ar-a000002 ar-a000002 is a drug which is one of the first compounds developed to act as a selective antagonist for the serotonin receptor 5-ht1b, with approximately 10x selectivity for 5-ht1b over the closely related 5-ht1d receptor. it has been shown to produce sustained increases in levels of serotonin in the brain, and has anxiolytic effects in animal studies. ar-a000002clinical dataatc codenoneidentifiers iupac name (r)-n--4-morpholinobenzamide pubchem cid9846516chemspider8022230uniil3cz2xb4erchemical and physical dataformulac27h36n4o2molar mass448.611 g·mol−13d model (jsmol)interactive image smiles c5coccn5c(cc4)ccc4c(=o)nc2ccc1c(c2)c(ccc1c)n3ccn(c)cc3 inchi inchi=1s/c27h36n4o2/c1-20-3-10-26(31-13-11-29(2)12-14-31)25-19-22(6-9-24(20)25)28-27(32)21-4-7-23(8-5-21)30-15-17-33-18-16-30/h3-5,7-8,10,22h,6,9,11-19h2,1-2h3,(h,28,32)/t22-/m1/s1key:ihdruihijwctiy-jochjyfzsa-n (verify)