6-甲基-2,4,7(1H,3H,8H)-蝶啶三酮

3H-[1,2,5]selenadiazolo[3,4-d]pyrimidine-5,7-dione

1,3,6,8-tetrahydro-2,4,5,7-pyrimido<5,4-g>pteridinetetrone

2,4,6,8-tetrahydroxypyrimido(4,5-g)pteridine