| http://www.w3.org/ns/prov#value | - Concerning the novel compounds of Formulas IV, and V, it is preferred that R2 is hydrogen, alkyl, aryl, substituted C1 to C10 alkyl, C7 to C12 substituted arylalkyl or C7 to C12 alkylaryl; R1 is aryl, and Z is a nitrogen protecting group.
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