The invention relates to compositions and methods for treating or
preventing disease or disorders caused by or associated with certain
bacterial infection, especially Escherichia coli (E. coli) or Helicobacter
pylori (H. pylori) infection. One exemplary compound of the present
invention has the following formula I:
##STR1##
wherein n is 0 or 1, and R is selected from the group consisting of
C.sub.1-10 alkyl, C.sub.6-10 aryl and
##STR2##
and wherein when n is 0, R is not C.sub.6-10 aryl.
