US 10,175,578 B2  91  92  -continued  -continued  (Vile)  (Vlld)  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).  ~  ~’  coo-ti  o/tR3e  R2e  (Alla)  (Allb)  (Alie)  (Alld)  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. 