| http://www.w3.org/ns/prov#value | - ylthio, substituted phenylthio, phenylsulfoxide, substituted phenylsulfoxide, phenylsulfonyl or substituted phenylsulfonyl; X is hydroxy, protected carboxy, amino, protected amino, (monosubstituted)amino, (disubstituted)amino, an amino acid, aniline, substituted aniline or an amino-substituted heterocyclic ring; and Y is CO2 H, SH, NHR7 or C(O) NHR7, wherein R7 is a hydrogen atom, C1 to C6 alkyl o
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