6,8-dimethyl-2H-pyrimido[5,4-e][1,2,4]triazine-3,5,7-trione

6,8-dimethyl-4a-(5-methyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)-2,4-dihydropyrimido[5,4-e][1,2,4]triazine-3,5,7-trione

4a-[4-[(2E)-2-[(2-methoxyphenyl)methylidene]hydrazinyl]phenyl]-6,8-dimethyl-2,4-dihydropyrimido[5,4-e][1,2,4]triazine-3,5,7-trione

6,8-dimethyl-4a-[4-[(2E)-2-[(5-nitrofuran-2-yl)methylidene]hydrazinyl]phenyl]-2,4-dihydropyrimido[5,4-e][1,2,4]triazine-3,5,7-trione

4a-(1H-indol-3-yl)-6,8-dimethyl-2,4-dihydropyrimido[5,4-e][1,2,4]triazine-3,5,7-trione