alnespirone alnespirone alnespirone (s-20,499) is a selective 5-ht1a receptor full agonist of the azapirone chemical class. it has antidepressant and anxiolytic effects. alnespironeclinical dataatc codenoneidentifiers iupac name (+)-4-dihydro-2h-chromen-3-yl]-propylamino]butyl]-8-azaspirodecane-7,9-dione cas number138298-79-0 ypubchem cid178132chemspider8002134 yunii34e28bm822chemblchembl2104091comptox dashboard (epa)dtxsid30160560 chemical and physical dataformulac26h38n2o4molar mass442.600 g·mol−13d model (jsmol)interactive image smiles cl.o=c1n(c(=o)cc2(c1)cccc2)ccccn(3cc4c(oc)cccc4oc3)ccc inchi inchi=1s/c26h38n2o4.clh/c1-3-13-27(20-16-21-22(31-2)9-8-10-23(21)32-19-20)14-6-7-15-28-24(29)17-26(18-25(28)30)11-4-5-12-26;/h8-10,20h,3-7,11-19h2,1-2h3;1h/t20-;/m0./s1 ykey:qyfhcfnbyqzgkw-bdqaorghsa-n y (verify)