[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][C][=N][C][Ring1][Branch1][=C][Branch2][=Branch1][=Branch2][C][=C][C][=C][Branch1][Ring2][N][Ring1][Branch1][C][=Branch2][Ring2][P][=C][C][=C][C][=Branch1][Ring2][=N][Ring1][Branch1][C][=Branch2][Ring1][=Branch2][=C][C][=C][C][=Branch1][S][=C][Ring2][Ring1][Branch1][C][=C][C][=Branch1][=Branch1][=C][C][=C][Ring1][=Branch1][O][N][Ring1][=N][C][=C][C][=Branch1][=Branch1][=C][C][=C][Ring1][=Branch1][O][C][=C][C][=Branch1][=Branch1][=C][C][=C][Ring1][=Branch1][O][C][=C][C][=Branch1][=Branch1][=C][C][=C][Ring1][=Branch1][O]"}, {"from": "gpt", "value": "The molecule is a photosensitizing agent used in the treatment of squamous cell carcinoma of the head and neck. It was first authorized for market by the European Medicines Agency in October 2001. It is currently available under the brand name Foscan."}]