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In General Formulae (VIIa) to (VIIc), 

R$_{2}$ c to R 4 c each independently represent a hydrogen atom, a hydroxyl group, or a cyano group, provided that at least one of R$_{2}$c, ... , or R 4 c represents a hydroxyl group or a cyano group. It is preferable that one or two ofR$_{2}$c to R 4 c are hydroxyl group(s) and the remainders are hydrogen atoms. 

In General Formula (VIIa), it is more preferable that two of R$_{2}$c to R 4 c are hydroxyl groups and the remainders are hydrogen atoms. 

Examples of the repeating unit having a group represented by any one of General Formulae (VIIa) to (VIId) include those in which at least one of R$_{13}$ ’, ... , or R 16 ’ in General Formula (II-AB!) or (II-AB2) has a group represented by any one of General Formula (VII) (for example, a group -COORs in which Rs is a group represented by any one of General Formulae (VIIa) to (VIId)), and repeating units represented by the following General Formulae (Alla) to (AIId). 

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In General Formulae (Alla) to (AIId), 

R$_{1}$ c represents a hydrogen atom, a methyl group, a trif- luoromethyl group, or a hydroxymethyl group. 

R$_{2}$c to R 4 c have the same definitions as R 2 c to R 4 c in General Formulae (VIIa) to (VIIc). 

Specific examples of the repeating unit having a structure represented by any one of General Formulae (Alla) to (AIId) will be shown below, but the present invention is not limited thereto. 

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