[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][C][C][=Branch1][C][=O][N][C][C][C][C][Ring1][Branch1][C][=Branch1][C][=O][N][Branch2][Branch2][O][C][Branch2][#Branch1][#Branch1][C][=Branch1][C][=O][N][C][C][Branch2][Branch1][#C][C][=Branch1][C][=O][C][C][Ring1][#Branch1][C][=Branch1][C][=O][N][C][Branch2][Ring2][=Branch1][C][=Branch1][C][=O][O][C][Branch2][Ring1][N][C][Branch1][=Branch2][C][=Branch1][C][=O][N][Ring2][Ring1][P][N][C][=Branch1][C][=O][C][=C][Branch1][#Branch1][C][=C][C][=N][Ring1][=Branch1][O][C][C][=C][C][=C][C][=C][Ring1][=Branch1][C][S][C][C][N][C][C][C][Ring1][=Branch1][C][C][Ring1][=Branch1][C][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][N][Branch1][C][C][C][C]"}, {"from": "gpt", "value": "The molecule is a semi-synthetic derivative of pristinamycin, a natural occurring type B streptogramin. Quinupristin binds to the bacterial 50S ribosomal subunit, thereby inhibiting peptide chain elongation, and causing early termination of normal bacterial protein synthesis. Quinupristin is primarily effective against gram-positive cocci."}]