| 摘要 |
A compound of formula 1 wherein: X<- >is an anion with a single negative charge; A and B, which are identical or different, are each -O-, -S-, -NH-, -CH2-, -CH=CH-, or -N(C1-C4-alkyl)-; R is hydrogen, hydroxy, -C1-C4-alkyl, -C1-C4-alkyloxy, -C1-C4-alkylene-halogen, -O-C1-C4-alkylene-halogen, -C1-C4-alkylene-OH, -CF3, -CHF2, -C1-C4-alkylene-C1-C4-alkyloxy, -O-COC1-C4-alkyl, -O-COC1-C4-alkylene-halogen, -C1-C4-alkylene-C3-C6-cycloalkyl, -O-COCF3, or halogen; R<1 >and R<2>, which are identical or different, are each -C1-C5-alkyl, which is optionally substituted by -C3-C6-cycloalkyl, hydroxy, or halogen, or R<1 >and R<2 >together are a -C3-C5-alkylene bridge; R<3>, R<4>, R<3'>, and R<4'>, which are identical or different, are each hydrogen, C1-C4-alkyl, C1-C4-alkyloxy, hydroxy, -CF3, -CHF2, -CN, -NO2, or halogen; R<x >and R<x'>, which are identical or different, are each hydrogen, C1-C4-alkyl, C1-C4-alkyloxy, hydroxy, -CF3, -CHF2, -CN, -NO2, or halogen, or R<x >and R<x'</s
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