Secobarbital sodium309-43-3100 % similar Pentobarbital sodium57-33-073 % similar Amobarbital sodium64-43-745 % similar Sodium barbital144-02-544 % similar Phenobarbital sodium57-30-738 % similar 1,3-Diethyl 2-ethyl-2-(1-methylbutyl)propanedioate76-72-231 % similar (±)-Pentobarbital76-74-430 % similar