| http://www.w3.org/ns/prov#value | - 1 to 10 carbon atoms, R13 O-- groups in which R13 is as previously defined, ##STR6## groups in which R13 is as previously defined, hydroxyl groups, and cyano groups, and the radicals represented by R11 and R12 may be identical to or different from each other, X is a hydrogen atom, halogen atom, carboxyl group, ##STR7## group in which R13 is as previously defined, R13 O-- group in which R13 is as
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