prov:value
| - enyl, benzyl, phenylthio, halogen, such as fluoro, chloro, bromo, iodo, cyano, nitro,CF3,COR4, COOR',CONR4R5,SO2R4,So3R,SO2NR4R5,NR4R'orOR4, with the proviso, that when in formula III R2 stands for hydrogen and R'is CF3, then R'is notSO3, and wherein R4 and R5 independently from each other stand for hydrogen, Cic 4alkyl or phenyl, with the proviso, that at least one of the groups R', R2 or R3 is
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