prov:value
| - Z is selected from the group consisting of O, S, NR1, NH, Se, and CR7R8; R6 is selected from the group consisting of H, R1, R2, R3, and R4, and, when Z is O, NH, NR1, or S, R6 can further be an amino acid, peptide, polypeptide, protein, mono-, di- or polysaccharide, or other bioactive or pharmaceutical agent, wherein Z is an atom of said amino acid, peptide, polypeptide, protein, mono-, di- or pol
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