Patent ID: 6972281

Claim:
A compound of general formula I or a pharmaceutically acceptable salt thereof: wherein: A is -hydrogen, —(C 1 -C 8 )alkyl or —(C 3 -C 8 )alkyl substituted by hydroxy; B is —(C 1 -C 6 )alkylguanidino, —(C 1 -C 6 )alkyl(4-imidazolyl), —(C 1 -C 6 )alkylamino, p-aminophenylalkyl(C 1 -C 6 )—, p-guanidinophenylalkyl(C 1 -C 6 )— or 4-pyridinylalkyl(C 1 -C 6 )—; R 1 , R 2 and R 3 are, independent of one another, -hydrogen, -arylcarbonylamino, —(C 1 -C 6 )alkoylamino, —(C 1 -C 6 )alkylamino, —(C 1 -C 6 )alkyloxy, —(C 1 -C 6 )alkylaminocarbonyl, -carboxy, —OH, -benzoyl, -p-halogenobenzoyl, -methyl, —S-(2,4-dinitrophenyl), —S-(3-nitro-2-pyridinesulfenyl), -sulfonyl, -trifluoromethyl, —(C 1 -C 6 )alkylaminocarbonylamino, -halo or -amino; and, R 4 and R 5 are, independent of one another, -hydrogen, —(C 1 -C 6 )alkyl, -methyloxy, -nitro, -amino, -arylcarbonylamino, —(C 1 -C 6 )alkoylamino, —(C 1 -C 6 )alkylamino, -halo or —OH.