27032-78-6 5-Azadihydrouracil CCRIS 3441 DIHYDRO-1,3,5-TRIAZINE-2,4-DIONE Dihydro-1,3,5-triazine-2,4(1H,3H)-dione Dioxohexahydrotriazine EINECS 248-178-0 NSC 119749