| http://www.w3.org/ns/prov#value | - At least two substituents of Y are each independently selected from the group consisting of ???OH, ???NH2, and ???SH, provided that each of the ???OH, ???NH2, -or ???SH groups is not attached to the same carbon atom of Y or an ???O???, ???S???, or ???NH??? backbone moiety of Y. R2 is selected from the group consisting of ???OH, ???OR, NHR, alkyl, and arylalkyl, wherein R is an alkyl or an arylalky
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