. "ogen, lower alkyl or halogen, or R9 is hydrogen or lower alkyl, R10 is hydrogen, lower alkyl or halogen, R11 is hydrogen, lower alkyl, cycloalkyl or halogen, m is 0 or 1, n is an integer of 2 to 10, provided, that no more than one of R1 or R2 can be hydroxy, alkanoyloxy, or ##STR64## or a salt thereof with a pharmaceutically acceptable base when R is hydrogen or when R is --(CH2)n --N--(lower alky" . . .