prov:value
| - R2 may represent, e.g., a halogen atom or the groups such as alkyl, aryl, alkoxy, aryloxy, alkythio, arylthio, acyl, alkoxycarbonyl, carbamoyl (e.g., alkylcarbamoyl, arylcarbamoyl) ureido (e.g., alkylureido, arylureido), sulfamoyl (e.g., alkylsufamoyl, arylsulfamoyl), amino, alkylsulfonyl, arylsulfonyl, nitro, cyano and carboxy.
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