Pharmacologically active 1,2,4-triaminobenzene derivatives of the general formula <；IMAGE>； in which the symbols R1, R2, R3, R4, R5, Ar and Alk have the following meanings: R1: hydrogen, C1-C6-alkyl, C2-C6-alkanoyl or the radical Ar； R2: hydrogen or C1-C6-alkyl； R3: C1-C6-alkoxy, NH2, C1-C6-alkylamino, C1-C6- dialkylamino, amino which is substituted by the radical Ar, or C1-C6-alkyl, C2-C6-alkenyl, C2-C6-alkynyl, the radical Ar or the radical ArO-； R4: hydrogen, C1-C6-alkyl or the radical Ar； R5: hydrogen, C1-C6-alkyl or the radical Ar； Alk: a straight-chain or branched alkylene group with 1 - 9 C atoms, which can also be substituted by the radical Ar； Ar: phenyl radical which is substituted by the radicals R6, R7 and/or R8, where these radicals R6, R7 and R8 are identical or different and denote C1-C6-alkyl, C3-C7-cycloalkyl, hydroxyl, C1-C6-alkoxy, C2-C6-alkanoyloxy, halogen, hydroxyl, C1-C6-haloalkyl, -CN, -NH2, -NH-C1-C6-alkyl, -N(C1-C6-alkyl)2, -CO2H, -CO-C1 -C6-alkyl, -CO-O-C1-C6-alkyl, -COAr, -CO-OAr, -CONH2, -CONH-C1-C6-alkyl, -CON-(C1-C6-alkyl)2, -CONHAr, -NH-CO-C1-C6-alkyl, -NHCO-Ar, NHCO-C1-C6-alkoxy, -NH-CO-OAr, -NHCO-NH2, -NHCO-N(C1-C6-alkyl)2, -NHCO-NHAr, -NH-SO2-C1-C6-alkyl, -NH-SO2Ar, -NH-SO2-nitrophenyl, -SO2-OH, -SO2-C1-C6-alkyl, -SO2-Ar, -SO2-C1-C6-alkoxy, -SO2-OAr, -SO2-NH2, -SO2-NH-C1-C6-alkyl, -SO2-N(C1-C6-alkyl) 2, -SO2-NHAr, -SO2-C1-C6-alkoxy； n: 0 or 1； and their pharmaceutically compatible acid addition salts.
