| http://www.w3.org/ns/prov#value | - Optional substituents present on the groups R.sup.8 include for example one or more halogen atoms such as fluorine, chlorine, bromine or iodine atoms, or C.sub.1-4 alkyl, e.g. methyl or ethyl, orC.sub.1-4 alkoxy, e.g. methoxy or ethoxy, groups.In general, when the group R represents as esterified carboxyl group, it may be a metabolically labile ester of a carboxylic acid.When the groups R.sup.1 an
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