[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C@H1][/C][=C][/C][=C][Branch2][#Branch1][#Branch2][\\C][=Branch1][C][=O][N][C][=C][C][=Branch2][=Branch1][=C][=C][C][=Branch1][Branch1][=C][Ring1][=Branch1][O][C][=Branch2][Branch1][P][=C][Branch2][Branch1][N][C][=C][Ring1][Branch2][C][=Branch1][C][=O][C@][Branch1][Ring2][O][Ring1][=Branch1][Branch2][Ring2][#Branch2][O][/C][=C][/C@@H1][Branch2][Ring1][P][C@H1][Branch2][Ring1][N][C@H1][Branch2][Ring1][C][C@@H1][Branch1][=C][C@@H1][Branch1][#Branch2][C@@H1][Branch1][=Branch1][C@H1][Ring2][Ring1][P][O][C][O][C][O][C][=Branch1][C][=O][C][C][O][C][C][C][O][O][/C]"}, {"from": "gpt", "value": "The molecule is a natural antibiotic produced by Streptomyces mediterranei, Rifamycin (Ansamycin Family) is a commonly used antimycobacterial drug that inhibits prokaryotic DNA-dependent RNA synthesis and protein synthesis; it blocks RNA-polymerase transcription initiation. Rifamycin has an activity spectrum against Gram-positive and Gram-negative bacteria, but is mainly used against Mycobacterium sp. (especially M. tuberculosis) in association with other agents to overcome resistance. (NCI04)"}]