| abstract |
Pharmaceutical compounds of the formula ##STR1## in which n is 0, 1 or 2 and m is 1 or 2, R 1 is hydrogen, C 1-10 alkyl, C 2-10 alkenyl, C 2-10 alkynyl, phenyl, naphthyl, C 1-10 alkyl-phenyl, C 2-10 alkenyl-phenyl or C 2-10 alkynyl-phenyl, said phenyl and naphthyl groups being optionally substituted, R 2 is hydrogen or a protecting group, and Q is an acidic group; or a salt or ester thereof. |