[{"from": "human", "value": "Describe this molecule. [C][C@H1][C@H1][C][N][C][C][C][=C][Branch2][Ring1][Branch1][C@@H1][Ring1][=Branch1][C][C@@H1][Ring1][#Branch2][C][=Branch1][Branch1][=C][O][Ring1][=C][C][=Branch1][C][=O][O][C][N][C][=C][C][=C][C][=C][Ring2][Ring1][Ring1][Ring1][=Branch1]"}, {"from": "gpt", "value": "The molecule is a monoterpenoid indole alkaloid with formula C21H24N2O3, isolated from several Rauvolfia and Catharanthus species. It is a selective alpha1-adrenoceptor antagonist used for the treatment of high blood pressure. It has a role as an antihypertensive agent, an alpha-adrenergic antagonist and a vasodilator agent. It is a monoterpenoid indole alkaloid, a methyl ester and an organic heteropentacyclic compound. It is a conjugate base of an ajmalicine(1+)."}]