6,8-Dimethylpyrimido(5,4-e)-1,2,4-triazine-5,7(6H,8H)-dione-4-oxide 62758-20-7 BRN 1220136 Fervenulin-4-oxide Pyrimido(5,4-e)-1,2,4-triazine-5,7(6H,8H)-dione, 6,8-dimethyl-, 4-oxide