| http://www.w3.org/ns/prov#value | - to 5 carbon atoms or an alkoxycarbonyl group having 2 to 4 carbon atoms,R.sup.3 represents a hydrogen atom, an alkoxycarbonyl group having 2 to 4 carbon atoms, a dialkylaminocarbonyl group having 1 to 9 carbon atoms in each alkyl moiety, an alkoxy group having 1 to 5 carbon atoms, or a hydroxyethyl group,R.sup.2 and R.sup.3 may together form a group selected from ##STR154## wherein l.sub.1 is a n
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