3'-Ketohexobarbital
5-(3-hydroxy-phenyl)-1,5-dimethyl-barbituric acid
(+)-Hexobarbital
Propionic acid (R)-5-cyclohex-1-enyl-3,5-dimethyl-2,4,6-trioxo-tetrahydro-pyrimidin-1-ylmethyl ester
(R)-5-(1-cyclohexenyl)-5-methyl-1-(propionyloxymethyl)barbital