| http://www.w3.org/ns/prov#value | - , in which R is hydroxy, alkoxy or amino; with the proviso that when the optional substitution is hydroxy or amino said substitution cannot be present on a carbon atom adjacent to a heteroatom; and Z is hydrogen, optionally substituted monocyclic aryl or optionally substituted monocyclic heteroaryl; with the proviso that Z is hydrogen only when Y is a covalent bond and X is optionally substituted
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