| http://www.w3.org/ns/prov#value | - Rb, Rb???, Rb???, Rc, Rc??? and Rc??? each preferably independently represents an alkylene group having from 1 to 12 carbon atoms, and particularly preferably an alkylene group having from 1 to 6 carbon atoms (e.g., a methylene group, an ethylene group, a propylene group, a butylene group, or a hexylene group).
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