| http://www.w3.org/ns/prov#value | - feronyl, 3-flavonyl, o-nitrophenyl, m-nitrophenyl, p-nitrophenyl, dinitrophenyl, cyanophenyl, acylphenyl, carboxyphenyl, phenylsulfonate, phenylsulfonyl and phenylsulfoxide, R' is a moiety selected from the group consisting of hydrogen, alkyl, cycloalkyl, aryl, araalkyl, acyl, oxaalkyl and oxacycloalkyl, and R is hydrogen or a cation selected from the group consisting of calcium, barium, lithium,
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