| http://www.w3.org/ns/prov#value | - e ??-carboxyl group or optionally through the ??-carboxyl group when the amino acid is aspartic acid or glutamic acid or a peptide derived from D, L or mixed D and L amino acids linked through a carboxyl group; Z3 is hydrogen, an amino protecting group, ???C1-C6 alkyl, ???C(???O)???CH3, benzyl, benzoyl, or ???(CH2)n???N(H)Z1; each J is O, S or NH; R5 is a carbonyl protecting group; and n is from 2
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