5-Pivaloyloxy-5-(1-phenylethyl)barbituric acid 55675-67-7 Hexahydro-2,4,6-trioxo-5-(1-phenylethyl)-5-pyrimidinyl 2,2-dimethylpropanoate Propanoic acid, 2,2-dimethyl-, hexahydro-2,4,6-trioxo-5-(1-phenylethyl)-5-pyrimidinyl ester