| http://www.w3.org/ns/prov#value | - in which case the substituents on the substituted phenyl are selected from halogen, such as fluorine, chlorine, bromine or iodine, lower alkyl of from 1 to 4 carbon atoms and lower alkoxy of from 1 to 4 carbon atoms; Z is hydrogen or hydroxy; R is hydrogen, lower alkyl of from 1 to 4 carbon atoms, phenyl or benzyl; R. sup. 1 is hydrogen, lower alkyl of from 1 to 4 carbon atoms or halogen, such as
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