The<unk> s are a group of antibiotics that are synthesized either naturally by the bacterium Amycolatopsis<unk> ica or artificially. They are a subclass of the larger family of ansamycins.<unk> s are particularly effective against mycobacteria, and are therefore used to treat tuberculosis, leprosy, and mycobacterium avium complex (MAC) infections. The<unk>  group includes the "classic"<unk>  drugs as well as the<unk>  derivatives rifampicin (or rifampin), rifabutin, rifapentine, rifalazil and rifaximin.<unk> , sold under the trade name Aemcolo, is approved in the United States for treatment of travelers' diarrhea in some circumstances.
Rifamycin
Meropenem
Imipenem
Vancomycin
Spiramycin
Resistin
Ertapenem
Amikacin