[{"from": "human", "value": "Could you provide a description of this molecule? [C][N][C][=N][C][=Branch2][Ring1][C][=C][Ring1][Branch1][S][C][=N][C][=N][C][=C][Ring1][=Branch1][N][=C][N-1][Ring1][Branch1][N+1][=Branch1][C][=O][O-1].[Na+1]"}, {"from": "gpt", "value": "The molecule is the sodium salt form of azathioprine, a pro-drug of purine analogue with immunosuppressive activity. Azathioprine is converted in vivo to its active metabolite 6-mercaptopurine (6-MP), which substitutes for the normal nucleoside and mistakenly gets incorporated into DNA sequences. This leads to inhibition of DNA, RNA, and protein synthesis. As a result, cell proliferation may be inhibited, particularly in lymphocytes and leukocytes."}]