2,4-bis[2-(4-chlorophenyl)-2-oxoethylidene]cyclobutane-1,3-dione

对甲苯异硫氰酸酯

3,6-bis[2-(4-chlorophenyl)-1-methoxy-2-oxoethylidene]-1,4-dithiane-2,5-dione

5-异丁基咪唑啉-2,4-二酮

甲酰乙内脲