| http://www.w3.org/ns/prov#value | - By an alkenyloxy group in the definition of R, R1 and R2 is meant an unsaturated hydrocarbon residue with two to six carbon atoms, such as vinyl, allyl, ??-allyl, iso-allyl, 1-butenyl, 2-butenyl, 3-butenyl, iso-butenyl, 2-methylallyl, 1-pentenyl and 3,3-dimethylallyl groups.
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