Herein, A1 is a divalent group selected from among furandiyl, tetrahydrofurandiyl and oxanorbornanediyl; R01 and R02 are each independently a monovalent, straight, branched or cyclic C1-C10 hydrocarbon group, or R01 and R02, taken together, may form an aliphatic hydrocarbon ring with the carbon atom to which they are attached; and R03 is hydrogen or a monovalent, straight, branched or cyclic C1-C1