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For example, when R$_{1 }$ and/or R$_{2 }$ are a cycloalkylene group, R$_{1 }$ and/or R$_{2 }$ are preferably an adamantylene group, a noradamantylene group, a decahydronaphthylene group, a tricyclodecanylene group, a tetracyclododecanylene group, a norbornylene group, a cyclopentylene group, a cyclohex› ylene group, a cycloheptylene group, a cyclooctylene group, a cyclodecanylene group or a cyclododecanylene group, more preferably an adamantylene group, a norbornylene group, a cyclohexylene group, a cyclopentylene group, a tetracyclododecanylene group or a tricyclodecanylene group. 

The non-aromatic hydrocarbon group ofR$_{1 }$and/or R$_{2 }$ may have a substituent. Examples of this substituent include an alkyl group having a carbon number of 1 to 4, a halogen atom, a hydroxy group, an alkoxy group having a carbon number of 1 to 4, a carboxy group, and an alkoxycarbonyl group having a carbon number of 2 to 6. These alkyl group, alkoxy group and alkoxycarbonyl group may further have a substituent, and examples of the substituent include a hydroxy group, a halogen atom, and an alkoxy group. 

L$_{1 }$ represents a linking group represented by --COO-, ---OCO-, -CONH-, ---0-, -Ar-, -S0$_{3}$ - or -S0$_{2}$ NH-, wherein Ar represents a divalent aromatic ring group. L$_{1 }$ is preferably a linking group represented by --COO-, ----CONH- or -Ar-, more preferably a link› ing group represented by --COO- or ----CONH-. 

R represents a hydrogen atom or an alkyl group. The alkyl group may be linear or branched. The carbon number of this alkyl group is preferably from 1 to 6, more preferably from 1 to 3. R is preferably a hydrogen atom or a methyl group, more preferably a hydrogen atom. 

R$_{0 }$ represents a hydrogen atom or an organic group. Examples of the organic group include an alkyl group, a cycloalkyl group, an aryl group, an alkynyl group, and an alkenyl group. R$_{0 }$ is preferably a hydrogen atom or an alkyl group, more preferably a hydrogen atom or a methyl group. L$_{3 }$ represents an (m+2)-valent linking group. That is, L$_{3 }$ represents a trivalent or higher valent linking group. Examples of such a linking group include corresponding groups in specific examples illustrated later. 

RL represents an (n+l)-valent linking group. That is, RL represents a divalent or higher valent linking group. 

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