Novel 6-phenlyphenanthridines

A compound of the formula I,

• in which
• R1 is hydroxyl, 1-4C-alkoxy, 3-7C-cycloalkoxy, 3-7C-cycloalkylmethoxy or completely or predominantly fluorine-substituted 1-4C-alkoxy,
• R2 is hydroxyl, 1-4C-alkoxy, 3-7C-cycloalkoxy, 3-7C-cycloalkylmethoxy or completely or predominantly fluorine-substituted 1-4C-alkoxy,
• or in which R1 and R2 together are a 1-2C-alkylenedioxy group,
• R3 is hydrogen or 1-4C-alkyl,
• R31 is hydrogen or 1-4C-alkyl, p1 or in which R3 and R31 together are a 1-4C-alkylene group,
• R4 is hydrogen or 1-4C-alkyl,
• R5 is hydrogen,
• R51 is hydrogen,
• or in which R5 and R51 together represent an additional bond,
• R6 is hydrogen, halogen, nitro, 1-4C-alkyl, trifluoromethyl or 1-4C-alkoxy,
• R7 is 1-4C-alkyl, 3-7C-cycloalkyl, 3-7C-cycloalkylmethyl, pyridinyl, phenyl or R71- and/or R72-substituted phenyl, wherein
• R71 is halogen, hydroxyl, cyano, trifluoromethyl, carboxyl, nitro, 1-4C-alkyl or 1-4C-alkoxy,
• R72 is 1-4C-alkoxy, 1-4C-alkyl or halogen,
• R8 is hydrogen, phenyl, 1-4C-alkyl, aryloxy-2-4C-alkyl or R9-substituted 1-4C-alkyl, wherein
• aryloxy is phenoxy or R81-substituted phenoxy, wherein
• R81 is halogen or trifluoromethyl,
• R9 is phenyl, C(O)N(R91)R92 or R93-substituted phenyl, wherein
• R91 is phenyl, aryl-1-4C-alkyl or R911-substituted phenyl, wherein
• aryl is phenyl or R81-substituted phenyl,
• R911 is 1-4C-alkoxy or completely or predominantly fluorine-substituted 1-4C-alkoxy,
• R92 is hydrogen,
• or wherein R91 and R92, together and including the nitrogen atom to which both are bound, represent a 1-pyrrolidinyl, 1-piperidinyl, 1-piperazinyl, 4-methylpiperazin-1-yl, 4-phenylpiperazin-1-yl, 1-hexahydroazepinyl or 4-morpholinyl radical,
• R93 is nitro, 1-4C-alkyl, 1-4C-alkoxycarbonyl, halogen, trifluoromethyl, 1-4C-alkoxy or completely or predominantly fluorine-substituted 1-4C-alkoxy,
• or a salt or an E/Z isomer thereof.