| http://www.w3.org/ns/prov#value | - yl, 2-propenyl, and alkyloxyacyl where alkyl is as defined above, and X1 is a member selected from the group consisting of:(a) phenyl, (b) a monosubstituted phenyl of the formula: ##STR27## wherein provided that only one of groups R, R1, R2, R3, R4 is other than hydrogen and R or R4 is alkyl of from 1 to 8 carbon atoms, inclusive, including isomeric forms, alkoxy of from 1 to 8 carbon atoms, inclu
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