[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][S][=Branch1][C][=O][=Branch1][C][=O][O].[C][C@@H1][C][C][Branch1][P][C][C][N][Ring1][=Branch1][C][C][=Branch1][C][=O][C][Ring1][O][C][Ring1][#Branch1][O][C][=Branch1][C][=O][C][=C][N][C][=C][C][=C][C][=C][Ring1][=Branch1][Ring1][=Branch2]"}, {"from": "gpt", "value": "The molecule is an indole derivative with antiemetic activity.  As a selective serotonin receptor antagonist, dolasetron mesylate competitively blocks the action of serotonin at 5HT3 receptors, resulting in suppression of chemotherapy- and radiotherapy-induced nausea and vomiting. (NCI04)"}]