| 摘要 |
Compounds of the formula <IMAGE> wherein: Ar and Ar' are independently alicyclic aryl or heterocyclic aryl groups; R1 is a substituent replacing a hydrogen on the ring and is independently hydroxy, alkyl, alkoxy, halogen, nitro, amino, monoalkyl-amino, dialkyl-amino, sulfhydryl, alkylmercapto, sulfonamido, carboxy, carbalkoxy, or trihalomethyl; n is an integer from 0 to 5 inclusive; R2 and R3 are independently hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, phenyl, or cycloalkyl-alkyl; and R4 and R5 are independently halogen or trihalomethyl, with the proviso that when both Ar and Ar' are phenyl and n is 0, both R2 and R3 are not hydrogen.
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