5,7-二甲基-5H-嘧啶并[4,5-e][1,2,4]三嗪-6,8-二酮

氰乙酸乙酯

1,3-二甲基氰乙酰脲

1,3-dimethyl-6-[(triphenyl-λ⁵-phosphanylidene)amino]pyrimidine-2,4-dione

乙酸酐