| http://www.w3.org/ns/prov#value | - d to provide for an analogue of compound 1.Alternatively, an ester such as H.sub.2NCH(R.sup.2)C(O)NHCH(R.sup.2)COOR where each R.sup.2 is independently as defined above and R is typically an alkyl group can first be formed by conventional peptide synthetic procedures.
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