[{"from": "human", "value": "Could you provide a description of this molecule? [C][=C][Branch1][#C][N][C][=Branch1][C][=O][C][=C][Ring1][#Branch1][N][C][=N][Ring1][Branch1][N]"}, {"from": "gpt", "value": "The molecule is a purine nucleoside analogue with antineoplastic and antiviral activities.  By replacing guanine, dezaguanine incorporates into DNA and inhibits de novo purine synthesis, thereby inducing cell death. (NCI)"}]