[{"from": "human", "value": "Provide a brief overview of this molecule. [C][N][C][C][C][Branch1][Branch1][C][C][Ring1][=Branch1][N][Branch1][=Branch2][C][C][=C][C][=C][S][Ring1][Branch1][C][=C][C][=C][C][=C][Ring1][=Branch1]"}, {"from": "gpt", "value": "Withdrawn from the Canadian, US, and UK markets in 1963 due to concerns involving neutropenia."}]