abstract |
wherein, in the formula (2), R1 represents a hydrogen atom or a methyl group, R2 represents a hydrocarbon group which may have a substituent, and L1 represents a divalent hydrocarbon group; and in the formula (3), R3, R4, and R5 each independently represent a divalent hydrocarbon group which may have a substituent, 1≤a+b≤50). |