the 12 antimicrobial agents tested were ampicillin , amoxicillin , clindamycin , chloramphenicol , erythromycin , furazolidone , norfloxacin , nalidixic acid , rosoxacin , rosaramicin , tetracycline , and sch 32063 .
C1136254
antimicrobial
C0028365
norfloxacin