1,3-Dimethyl-2,4-dioxo-6-benzyl-1,2,3,4,5,6,7,8-octahydropyrimido(4,5-d)pyrimidine 71803-56-0 Dmdobohpp NSC 350009 Pyrimido(4,5-d)pyrimidine-2,4(1H,3H)-dione, 5,6,7,8-tetrahydro-1,3-dimethyl-6-(phenylmethyl)-