[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C@H1][C@@H1][Branch2][=Branch1][Branch1][C@H1][Branch2][Branch1][S][C][C@@H1][Branch1][Ring2][O][Ring1][=Branch1][O][C@H1][C][C@@][Branch2][Ring2][=Branch2][C][C][=C][Ring1][=Branch1][C][=Branch2][Ring1][#C][=C][C][=Branch1][Branch1][=C][Ring1][=Branch1][O][C][=Branch1][C][=O][C][=C][Branch1][Branch1][C][Ring1][=Branch2][=O][C][=Branch1][=Branch1][=C][C][=C][Ring1][Branch2][O][C][O][Branch1][#Branch1][C][=Branch1][C][=O][C][O][O][N][O]"}, {"from": "gpt", "value": "The molecule is only found in individuals that have used or taken this drug. It is an anthracycline which is the 4&#39;-epi-isomer of doxorubicin. The compound exerts its antitumor effects by interference with the synthesis and function of DNA. Epirubicin has antimitotic and cytotoxic activity. It inhibits nucleic acid (DNA and RNA) and protein synthesis through a number of proposed mechanisms of action: Epirubicin forms complexes with DNA by intercalation between base pairs, and it inhibits topoisomerase II activity by stabilizing the DNA-topoisomerase II complex, preventing the religation portion of the ligation-religation reaction that topoisomerase II catalyzes. It also interferes with DNA replication and transcription by inhibiting DNA helicase activity."}]