Compounds of formula (I) and formula (II) are disclosed which are useful in
the treatment bacterial infections:
##STR1##
wherein:
R.sup.1 is C.sub.1-4 alkyl, Ar or 2-thienyl or 3-thienyl;
R.sup.2 is C.sub.1-4 alkyl or Ar; and
n is 0-3;
or a pharmaceutically acceptable salt thereof.
