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

甲基碘

6-azido-1,3-dimethylpyrimidine-2,4-dione

(Phenylcarbonylmethylene)triphenylphosphorane

4,6-二甲基-2H-三唑并[4,5-e]嘧啶-5,7-二酮