Compounds of formula 1 wherein R 1 denotes a group A selected from among -O-R 3, -NR 3 R 4, R 3 is a group selected from among -C 1-6 -alkyl, -C 1-6 -fluoroalkyl, -(C 1-5 -alkyl)-OH, -C 6-10 -aryl, -(C 1-4 -alkylene)-(C 6-10- aryl), -ethenyl, -(C 1-4 -alkylene)-(ethene), -ethynyl, -(C 1-4 -alkylene)-(ethyne), -(C 1-4 -alkylene)-(ethyne)-NH 2, -(C 1-4 -alkylene)-(ethyne)-(C 1-4 -alkylene)-NH 2, -NH(C 1-3 -alkyl), -(C 1-4 -alkylene)-NH(C 1-3 -alkyl), -CHOH-(C 1-4 -alkylene)-NH 2, -(C 1-4 -alkylene)-CHOH-(C 1-4 -alkylene)-NH 2, -(C 1-4 -alkylene)-CHOH-NH 2, -CHOH-NH 2, mono- or bicyclic, saturated or partly saturated -C 3-10 -cycloalkyl, mono- or bicyclic, saturated or partly saturated -(C 1-4 -alkylene)-C 3-10 -cycloalkyl, -(het), -(C 1-4 -alkylene)-(het), -(hetaryl), and -(C 1-4 -alkylene)-(hetaryl), wherein this group may optionally be substituted by one or more groups selected independently of one another from among H, -OH, -oxo, -COOH, -halogen, -C 1-3 -alkyl, -C 1-3 -haloalkyl, -C 1-3 -alkyl-OH, -C 3-7 -cycloalkyl, -O-(C 1-4 -alkyl), -NH(C 1-4 -alkyl), -(C 1-4 -alkylene)-NH(C 1-4 -alkyl), -N(C 1-4 -alkyl) 2, -(C 1-4 -alkylene)-N(C 1-4 -alkyl) 2, -NH-CO-NH 2, -(C 1-4 -alkylene)-NH-CO-NH 2, -CO-NH 2, -(C 1-4 -alkylene)-CO-NH 2, -CO-NH(C 1-3 -alkyl), -(C 1-4 -alkylene)-CO-NH(C 1-3 -alkyl), -CO-N(C 1-3 -alkyl) 2, -(C 1-4 -alkylene)-CO-N(C 1-3 -alkyl) 2, -NH- m -NH 2, -NH-(C 1-4 -alkylene)- m -NH 2, -NH- m -NH(C 1-3 -alkyl), -NH-(C 1-4 -alkylene)- m -NH(C 1-3 -alkyl),-NH- m -N(C 1-3 -alkyl) 2, -NH-(C 1-4 -alkylene)- m -N(C 1-3 -alkyl) 2, -O-(C 2-4 -alkylene)-NH 2, -O-(C 2-4 -alkylene)-NH(C 1-3 -alkyl), -O-(C 2-4 -alkylene)-N(C 1-3 -alkyl) 2, -NH-CO-(C 1-3 -alkyl), -(C 1-4 -alkylene)-NH-CO-(C 1-3 -alkyl), C 3-5 -cycloalkyl, -SO 2 -(C 1-4 -alkyl), -NH-(hetaryl), -NH-(C 1-4 -alkylene)-(hetaryl), -(het) and -(C 1-4 -alkylene)-(het), wherein (het) denotes a three- to ten-membered, saturated or partly saturated, mono- or bicyclic heterocyclic group, optionally substituted by 1-3 groups selected from C 1-3 -alkyl, halogen, CH 2 -NH 2, NH 2, OH, CO-NH 2 and oxo, which contains 1, 2 or 3 heteroatoms selected independently of one another from among N, O and S, and wherein (hetaryl) denotes a five- to ten-membered, mono- or bicyclic heteroaryl, optionally substituted by 1, 2 or 3 groups selected from C 1-3 -alkyl, halogen, CH 2 -NH 2, NH 2, OH, CO-NH 2 and oxo, which contains 1-3 heteroatoms selected independently of one another from among N, O and S, m = 0 or 1 R 4 denotes H, methyl or ethyl R 6 denotes methyl, as well as pharmaceutically acceptable salts thereof. R 1 denotes a group A selected from among -O-R 3, -NR 3 R 4, R 3 is a group selected from among -C 1-6 -alkyl, -C 1-6 -fluoroalkyl, -(C 1-5 -alkyl)-OH, -C 6-10 -aryl, -(C 1-4 -alkylene)-(C 6-10- aryl), -ethenyl, -(C 1-4 -alkylene)-(ethene), -ethynyl, -(C 1-4 -alkylene)-(ethyne), -(C 1-4 -alkylene)-(ethyne)-NH 2, -(C 1-4 -alkylene)-(ethyne)-(C 1-4 -alkylene)-NH 2, -NH(C 1-3 -alkyl), -(C 1-4 -alkylene)-NH(C 1-3 -alkyl), -CHOH-(C 1-4 -alkylene)-NH 2, -(C 1-4 -alkylene)-CHOH-(C 1-4 -alkylene)-NH 2, -(C 1-4 -alkylene)-CHOH-NH 2, -CHOH-NH 2, mono- or bicyclic, saturated or partly saturated -C 3-10 -cycloalkyl, mono- or bicyclic, saturated or partly saturated -(C 1-4 -alkylene)-C 3-10 -cycloalkyl, -(het), -(C 1-4 -alkylene)-(het), -(hetaryl), and -(C 1-4 -alkylene)-(hetaryl), R 4 denotes H, methyl or ethyl R 6 denotes methyl,