[{"from": "human", "value": "Provide a description of this molecule. [C][C][Branch1][C][C][N][C][C][Branch2][Ring1][Branch1][C][O][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][C][C][=Branch1][C][=O][O][C][O]"}, {"from": "gpt", "value": "The molecule is a cardioselective beta-1 receptor blocker. It has a rapid onset but short duration of action without causing significant intrinsic sympathomimetic or membrane stabilizing activities at recommended therapeutic doses. It works by blocking beta-adrenergic receptors in the heart, which leads to decreased force and rate of heart contractions. Esmolol prevents the action of two naturally occurring substances: epinephrine and norepinephrine.  The FDA withdrew its approval for the use of all parenteral dosage form drug products containing esmolol hydrochloride that supply 250 milligrams/milliliter of concentrated esmolol per 10-milliliter ampule. Other esmolol formulations are still available for use."}]