[{"from": "human", "value": "Could you provide a description of this molecule? [C][=N][N][N][=C][Ring1][Branch1][N][=C][Branch1][=Branch1][N][C][Ring1][=Branch2][=O][N]"}, {"from": "gpt", "value": "The molecule is one of the early purine analogs showing antineoplastic activity. It functions as an antimetabolite and is easily incorporated into ribonucleic acids."}]