[{"from": "human", "value": "Provide a description of this molecule. [C][S][=Branch1][C][=O][=Branch1][C][=O][C][=C][C][=Branch2][Ring2][Ring2][=C][C][=C][Ring1][=Branch1][N][Branch1][S][C][=C][Ring1][Branch1][C][C][C@@H1][Ring1][Branch1][C][C][=Branch1][C][=O][O][C][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][Cl][F]"}, {"from": "gpt", "value": "The molecule is a prostaglandin D2 receptor (DP1) antagonist with niacin-induced vasodilation inhibiting activity. Laropiprant binds to and inhibits the activity of DP1, a G-protein coupled receptor. Via competing with prostaglandin D2 (PG D2) for binding to DP1, this agent prevents PG D2-induced vasodilation and increased blood flow. As niacin induces the synthesis of PG D2, predominantly in the skin, administration of laropiprant may prevent niacin-induced vasodilation in the skin and facial flushing."}]