R1 is a hydrogen or halogen atom, or an aliphatic, carbocyclic, carbamoyl, sulfamoyl, {HEAD ~ carbonamido}, sulfonamido, alkoxycarbonyl, alkyl or arylketo, alkyl or arylsulfo, sulfo, hydroxy, acyl, nitro, cyano, amino, alkoxy, alkoxyalkyl, aryloxy, aryloxyalkyl, {TAIL ~ thioalkoxy}, thioalkoxyalkyl, thioaryloxy, thioaryloxyalkyl or heterocyclic group 
R1 is a hydrogen or halogen atom , or an aliphatic , carbocyclic , carbamoyl , sulfamoyl , { HEAD ~ carbonamido } , sulfonamido , alkoxycarbonyl , alkyl or arylketo , alkyl or arylsulfo , sulfo , hydroxy , acyl , nitro , cyano , amino , alkoxy , alkoxyalkyl , aryloxy , aryloxyalkyl , { TAIL ~ thioalkoxy } , thioalkoxyalkyl , thioaryloxy , thioaryloxyalkyl or heterocyclic group
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