5,6,7,8-Tetrahydro-1,3-dimethyl-6-ethylpyrimido(4,5-d)pyrimidine-2,4(1H,3H)-dione 64179-77-7 BRN 1122380 Pyrimido(4,5-d)pyrimidine-2,4(1H,3H)-dione, 5,6,7,8-tetrahydro-1,3-dimethyl-6-ethyl-