spirobarbital spirobarbital spirobarbital is a barbiturate derivative developed by eli lilly in the 1940s. it has hypnotic and sedative effects, and has a moderate potential for abuse. spirobarbitalclinical dataother names5-spiro-(2'-ethyl-3'-5'-dimethyl-cyclopentyl)barbituric acidatc codenoneidentifiers iupac name 1-ethyl-2,4-dimethyl-7,9-diazaspirodecane-6,8,10-trione cas number72035-36-0 ysodium salt: 12262-77-0 yuniilr477qh2ilsodium salt: 4ngd254io1 ychemical and physical dataformulac12h18n2o3molar mass238.287 g·mol−13d model (jsmol)interactive image smiles o=c2nc(=o)nc(=o)c12c(cc)c(c)cc1c (verify)