| http://www.w3.org/ns/prov#value | - STR5## wherein R.sup.2 is a substituted or unsubstituted alkyl, aryl or nitrogen containing heterocyclic group andR.sup.3 is an N-blocked amino acid residue or peptide chain and stereoisomers thereof.Formula III is a general formula and it includes the racemic, the D and the L stereoisomers of the compounds within its scope.Preferred compounds within Formula III as those wherein R.sup.2 is phenyl
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