| http://www.w3.org/ns/prov#value | - As the alkenyl group represented by R7 and R8, a substituted or unsubstituted alkenyl group having from 2 to 18 carbon atoms, and more preferably a substituted or unsubstituted alkenyl group having from 2 to 8 carbon atoms, such as vinyl, allyl, 1-propenyl, and 1,3-butadienyl is used.
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