Patent ID: 6887281

Claim:
A N-heteroarylmethyl-p-phenylenediamine derivative of the general formula (I), or a physiologically tolerated, water-soluble salt thereof, wherein X1 is sulfur, nitrogen, Câ€”R6 or Nâ€”R5, X2 is sulfur, nitrogen, Câ€”R6 or Nâ€”R5, X3 is sulfur, nitrogen, oxygen, Câ€”R6 or Nâ€”R5, R1 is hydrogen, a C 1 â€”C 4 alkyl group or a C 1 â€”C 4 hydroxyalkyl group, R2, R3 may be the same or different and, independently of one another, are hydrogen or a C 1 -C 6 alkyl group, R4, R6 may be the same or different and, independently of one another, are hydrogen, a halogen atom, a cyano group, a C 1 -C 4 alkoxy group, a C 1 -C 6 alkyl group, a C 1 -C 4 alkyl thioether group, a mercapto group, a nitro group, an amino group, a C 1 -C 4 alkylamino group, a di(C 1 -C 4 ) alkylamino group, a di(C 1 -C 4 hydroxyalkyl) amino group, a C 1 -C 4 hydroxyalkylamino group, a trifluoromethane group, a â€”C(O)CH 3 â€” group, a â€”C(O)CF 3 â€” group, an â€”Si(CH 3 ) 3 â€” group, a C 1 -C 4 hydroxyalkyl group or a C 3 -C 4 dihydroxyalkyl group and R5 is hydrogen, a C 1 -C 6 alkyl group, a C 1 -C 4 hydroxyalkyl group, a phenyl group or an acetyl group, at least one and not more than two of the X1 to X3 groups being Câ€”R6 and not more than one of the X1 to X3 groups being sulfur, or Nâ€”R5.