rifamycins rifampicin CHEBI:45308 Rif CHEBI:26577 A member of the class of rifamycins that is a a semisynthetic antibiotic derived from <em>Amycolatopsis rifamycinica</em> (previously known as <em>Amycolatopsis mediterranei</em> and <em>Streptomyces mediterranei</em>). CHEBI:8858 hydrazone N-iminopiperazine N-methylpiperazine cyclic ketal semisynthetic derivative first line tuberculosis drug