[{"from": "human", "value": "What can you tell me about this molecule? [C][=C][Branch2][Ring1][P][C][=C][Branch2][Ring1][O][C][=Branch2][Ring1][=Branch1][=C][Ring1][=Branch1][S][C][=C][Branch1][=N][C][=Branch1][=Branch2][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][Cl][Cl][O][O][Cl][Cl]"}, {"from": "gpt", "value": "Bithionol, formerly marketed as an active ingredient in various topical drug products, was shown to be a potent photosensitizer with the potential to cause serious skin disorders. Approvals of the NDA's for bithionol drug products were withdrawn on October 24, 1967 (see the Federal Register of October 31, 1967 (32 FR 15046))."}]