[{"from": "human", "value": "Describe this molecule. [C][C][=C][Branch1][S][C][=Branch1][Branch1][=N][O][Ring1][Branch1][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][S][=Branch1][C][=O][=Branch1][C][=O][N]"}, {"from": "gpt", "value": "Valdecoxib was removed from the Canadian, U.S., and E.U. markets in 2005 due to concerns about a possible increased risk of heart attack and stroke."}]