[{"from": "human", "value": "Describe this molecule. [C][O][C][=C][Branch2][Ring1][=C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][N][=C][N][=C][Ring1][#Branch1][N][C][=C][C][=Branch1][=Branch2][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][F][Cl][O][C][C][C][N][C][C][O][C][C][Ring1][=Branch1]"}, {"from": "gpt", "value": "The molecule is a drug used in the treatment of certain types of cancer. Acting in a similar manner to erlotinib (marketed as Tarceva), gefitinib selectively targets the mutant proteins in malignant cells. It is marketed by AstraZeneca under the trade name Iressa."}]