proxibarbital proxibarbital proxibarbital (ipronal) is a barbiturate derivative synthesized in 1956. it has anti-anxiety properties and is, in contrast to most barbiturates, almost without hypnotic action. proxibarbitalclinical dataother namesproxibarbital, centralgol, ipronal, 5-allyl-5-(β-hydroxypropyl)barbituric acidatc coden05ca22 (who) identifiers iupac name (rs)-5-allyl-5-(2-hydroxypropyl)pyrimidine-2,4,6(1h,3h,5h)-trione cas number2537-29-3 npubchem cid17336chemspider16406 yuniif97oms297fchemblchembl2105233echa infocard100.018.004 chemical and physical dataformulac10h14n2o4molar mass226.232 g·mol−13d model (jsmol)interactive image smiles o=c1nc(=o)nc(=o)c1(cc(o)c)c\c=c inchi inchi=1s/c10h14n2o4/c1-3-4-10(5-6(2)13)7(14)11-9(16)12-8(10)15/h3,6,13h,1,4-5h2,2h3,(h2,11,12,14,15,16) ykey:vnlmrpawamplnz-uhfffaoysa-n y ny (what is this?) (verify) it was also used in the treatment of migraine headaches in a similar manner to butalbital. valofane isomerises to proxibarbal in vivo.