Methyl 4-[4-(tert-butyl)phenyl]-6-(2-methoxy-2-oxo ethyl)-2-oxo-1,2,3,4-tetrahydro-5-pyrimidinecarboxMethyl 4-[4-(tert-butyl)phenyl]-6-(2-methoxy-2-oxoethyl)-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylatemethyl 4-[4-(tert-butyl)phenyl]-6-(2-methoxy-2-oxoethyl)-2-oxo-1,2,3,4-tetrahydro-5-pyrimidinecarboxylate