lower alkyloxycarbonyl, (aminocarbonyl)lower alkyl, [mono- and di(lower alkyl)aminocarbonyl]lower alkyl, carboxylower alkyl, (lower alkyloxycarbonyl)lower alkyl and (hydroxylower alkyl)aminocarbonyl; m is the integer 1 or 2; R2 is a member selected from the group consisting of hydrogen and lower alkyl; R3, R4 and R5 are each independently selected from the group consisting of hydrogen, hydroxy, lo