prov:value
| - X may be a hydrogen atom; an electron donating group such as amino, dimethylamino, hydroxy, methoxy, t-butyl, or methyl; or X may be an electron (withdrawing group such as phenyl, fluoro, chloro, bromo, iodo, --COOH, --COOR where R is a lower alkyl group, methycarbonyl, trifluoromethyl, cyano, methylsulfonyl, or nitro.
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