Abstract:
Novel quaternary pyridinium compounds useful in inhibiting acetylcholinesterase in mammals of the general structure: ##STR1## or pharmaceutically acceptable salts thereof, where R. sub. 5 is pentafluorophenyl, phenyl monosubstituted with K, phenyl disubstituted with K, phenyl trisubstituted with K, or naphthyl; R. sub. 6 is H, C. sub. 1-6 alkyl, phenyl, pentafluorophenyl, phenyl mono, di, or trisubstituted with K, C. sub. 1-6 alkyl with an attached phenyl group, C. sub. 1-6 alkyl with an attached phenyl group mono, di, or trisubstituted with K; K is halogen, COOH, OH, CN, NO. sub. 2, NH. sub. 2, C. sub. 1-6 alkyl, C. sub. 1-6 fluorinated alkyl, C. sub. 1-6 alkoxy, C. sub. 1-6 alkylamine, C. sub. 1-6 alkyl--O--CO--, C. sub. 1-6 alkyl--CO--NH--, C. sub.