prov:value
| - her form, with the nitrogen atom from which they depend, a nitrogen-containing heterocycle, or (d) a radical ???OR12, wherein R12 is a hydrogen atom, a linear or branched alkyl radical having from 1 to 20 carbon atoms, an alkenyl radical, a mono- or polyhydroxyalkyl radical, an optionally substituted aryl or aralkyl radical, or a sugar residue, or an amino acid residue or peptide residue; R13 is a
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