5,6,7,8-Tetrahydro-1,3,6-trimethylpyrimido(4,5-d)pyrimidine-2,4(1H,3H)-dione 64179-76-6 BRN 1117894 Pyrimido(4,5-d)pyrimidine-2,4(1H,3H)-dione, 5,6,7,8-tetrahydro-1,3,6-trimethyl-