[{"from": "human", "value": "Provide a brief overview of this molecule. [C][N][Branch1][C][C][C@H1][C@@H1][C][C@@H1][C@@H1][Branch2][Branch1][Branch1][C][=C][Branch2][Ring2][#C][C][=C][C][=Branch2][Ring2][Branch2][=C][Ring1][=Branch1][C][=Branch2][Ring1][S][=C][Ring1][#Branch2][C][=Branch1][C][=O][C@@][Ring1][#C][Branch2][Ring1][C][C][=Branch1][=C][=C][Branch1][=Branch1][C][Ring2][Ring1][Ring1][=O][C][=Branch1][C][=O][N][O][O][O][O][Cl][O]"}, {"from": "gpt", "value": "The molecule is a semi-synthetic, broad-spectrum naphthacene antibiotic produced by the bacterium Streptomyces aureofaciens. Demeclocycline binds to bacterial 30S ribosomal subunit and prevents binding of aminoacyl-tRNA to the mRNA-ribosome complex, thereby inhibiting protein synthesis. Demeclocycline also inhibits the effect of vasopressin on the renal tubules, thereby causing diuresis."}]