the substances were ampicillin , carbenicillin , cephaloridine , chloramphenicol , cloxacillin , erythromycin , gentamycin , nalidixic acid , neomycin , nitrofurantoin , penicillin , polymyxin b , sulfadiazine , tetracycline and trimethoprim + sulfamethoxazole .
C0006976
carbenicillin
C0030842
penicillin