2,4-二羰基六氢-1,3,5-三嗪

2,4-二氯-1,3,5-三嗪

缩二脲

4,4-methine-bis-(3-methyl-1-phenyl-2-pyrazolin-5-one)

2,5,2',5'-tetraphenyl-1,2,2',4'-tetrahydro-4,4'-methanylylidene-bis-pyrazol-3-one