prov:value
| - wherein R3, R4, R5, R6, R7, G, p, m and n are as defined above, R2-1 represents a C1-C4 alkyl group, a C2-C4 alkenyl group which is optionally substituted with a halogen atom, or a C2-C4 alkynyl group which is optionally substituted with a halogen atom, and X1 represents a leaving group such as a chlorine atom, a bromine atom, an iodine atom, a methanesulfonyl group, a p-toluenesulfonyl group or a
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