| http://www.w3.org/ns/prov#value | - In the groups (19) and (20), R3 and R4 each are preferably an alkylene group having 1 to 12 carbons, particularly preferably 1 to 8 carbons, and examples thereof include ethylene, propylene, trimethylene, tetramethylene, pentamethylene, hexamethylene, heptamethylene, octamethylene, and other groups.
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