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