899446-37-8 Pyrimido[4,5-d]pyrimidine-4-carboxylic acid,3,4,5,6,7,8-hexahydro-6,8-dimethyl-5,7-dioxo-3-phenyl-, ethyl ester 899446-42-5 Pyrimido[4,5-d]pyrimidine-4-carboxylic acid,3-(4-bromophenyl)-3,4,5,6,7,8-hexahydro-6,8-dimethyl-5,7-dioxo-, ethylester