[{"from": "human", "value": "Describe 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][Ring1][Branch1][N+1][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a Purine Antimetabolite. The mechanism of action of azathioprine is as a Nucleic Acid Synthesis Inhibitor."}]