| 摘要 |
A compound represented by the following general formula (II): <IMAGE> (II) wherein R1 and R2, which may be the same or different, represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a phenyl group, a benzyl group, a phenethyl group, an alkylamine group having 1 to 4 carbon atoms, or a dialkylamino group having 2 to 8 carbon atoms, and <IMAGE> represents a nobornylidene group or bicyclo [3,3,1]9-nonylidene group which may have a substituent, and <IMAGE> represents a pyridine, quinoline, pyrrole or benzothiophene group which may have a substituent.
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