prov:value
| - In formulae (12), (13), (15) and (16), R1 and R2 each are preferably an alkylene group having 1 to 12 carbons, particularly preferably having 1 to 8 carbons, and examples thereof include ethylene, propylene, trimethylene, tetramethylene, pentamethylene, hexamethylene, heptamethylene, and octamethylene groups, and the like.
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