6-(2-Chlorophenyl)-1,3,7-trimethylpyrimido(4,5-d)pyrimidine-2,4,5(1H,3H,6H)-trione 64467-25-0 BRN 1174240 Pyrimido(4,5-d)pyrimidine-2,4,5(1H,3H,6H)-trione, 6-(2-chlorophenyl)-1,3,7-trimethyl-