13922-58-2 3,5-Dimethyl-3,4-dihydro-2H-pyrimido[4,5-e][1,3]oxazine-6,8(5H,7H)-dione AIDS-126250 AIDS126250 NSC102268 {2H-Pyrimido[4,5-e][1,3]oxazin-2-one,} 1,6,7, 8-tetrahydro-4-hydroxy-1,7-dimethyl-