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Below, general formula (III) will be described. 

In general formula (III), each ofR$_{31}$, R$_{32 }$and R$_{33 }$indepen› dently represents a hydrogen atom, an alkyl group, a monova› lent aliphatic hydrocarbon ring group, a halogen atom, a cyano group or an alkoxycarbonyl group. When X$_{31 }$ to be described below is a single bond while L$_{31 }$ is a bivalent 

aromatic ring group, R$_{32 }$may form a ring in cooperation with the aromatic ring group ofL$_{3 }$ i, which R$_{32 }$in this instance is an alkylene group. 

Particular examples of the alkyl group, monovalent ali› phatic hydrocarbon ring group, halogen atom, cyano group and alkoxycarbonyl group represented by each of R$_{3}$ i, R$_{32 }$ 

