1-Demethyltoxoflavine 5016-18-2 6-Methylpyrimido(5,4-e)-as-triazine-5,7(1H,6H)-dione BA 51-090492 NSC 99733 Pyrimido(5,4-e)-as-triazine-5,7(1H,6H)-dione, 6-methyl- Pyrimido(5,4-e)-as-triazine-5,7(6H,8H)-dione, 6-methyl- Reumitsin Reumycin Rheumygin