| http://www.w3.org/ns/prov#value | - ' (where R' is a hydrogen atom, an alkyl group or an acyl group and X is an oxygen atom or a sulfur atom), a nitro group, an amino group, an alkylamino group, an acylamino group or a halogen atom, with the proviso that when both of R1 and R2 are hydrogen atoms, R3 should not be hydroxyl group, methoxy group or acetoxy group.
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