only three of the nine mutagenic substances ( beta-propiolacton , nitrosoguanidin and mitomycin c ) and six of the 15 chemotherapeutics ( penicillin g , ampicillin , cephalothin , nebacetin , novobiocin and nalidixie acid ) showed inducing effects .
C0030827
penicillin g
C0002680
ampicillin