| 摘要 |
Compounds having the structural formula <CHEM> wherein R1, R2, R3, R4 and R5 are the same or different and are selected from the group consisting of hydrogen, chlorine, bromine, iodine, nitro, alkyl having from 1 to 4 carbon atoms, alkoxy having from 1 to 4 carbon atoms, trifluoromethyl, trifluoromethoxy, cyano, alkylsulfonyl, and alkylthio having from 1 to 4 carbon atoms, and wherein R2 and R3 or R3 and R4 together can be methylene or ethylenedioxy. |
