thialbarbital thialbarbital thialbarbital (intranarcon) is a barbiturate derivative invented in the 1960s. it has sedative effects, and was used primarily for induction in surgical anaesthesia. thialbarbital is short acting and has less of a tendency to induce respiratory depression than other barbiturate derivatives such as pentobarbital. thialbarbitalclinical dataother nameskemithal, 5-(1-cyclohex-2-enyl)-5-prop-2-enyl-2-sulfanylidene-1,3-diazinane-4,6-dioneatc codenonelegal statuslegal status ca: schedule iv identifiers iupac name 5-allyl-5-cyclohex-2-en-1-yl-2-thioxodihydropyrimidine-4,6(1h,5h)-dione cas number467-36-7 yas salt: 3546-29-0 ypubchem cid3032306chemspider2297316 yuniienv72c33qdas salt: rhk739s84f ychemblchembl2104657 necha infocard100.006.720 chemical and physical dataformulac13h16n2o2smolar mass264.34 g·mol−13d model (jsmol)interactive image smiles o=c1nc(=s)nc(=o)c1(c2/c=c\ccc2)c\c=c inchi inchi=1s/c13h16n2o2s/c1-2-8-13(9-6-4-3-5-7-9)10(16)14-12(18)15-11(13)17/h2,4,6,9h,1,3,5,7-8h2,(h2,14,15,16,17,18) ykey:pxlvrfqebvnjoh-uhfffaoysa-n y ny (what is this?) (verify) synthesis thialbarbital synthesis: volwiler, tabern, u.s. patent 2,153,730 (1939 to abbott)