R3 in the general formula (VII) is a divalent hydrocarbon group of carbon number 1-20 (some or all of the hydrogen atoms in these hydrocarbon groups can be substituted with halogen atom independently) or the group represented by --R5 --X--R6 -- (each of R5 and R6 is a divalent aromatic hydrocarbon group, and a hydrogen atom on its aromatic ring may be substituted with a halogen atom, a hydrocarbon