[{"from": "human", "value": "Describe this molecule. [C][C][=C][C][=Branch2][Ring2][Branch2][=N][C][=Branch1][Ring2][=N][Ring1][=Branch1][O][C@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][C][Branch1][=Branch2][C][=C][C][=C][C][=C][Ring1][=Branch1][Branch1][=Branch2][C][=C][C][=C][C][=C][Ring1][=Branch1][O][C][C]"}, {"from": "gpt", "value": "The molecule is an endothelin receptor antagonist used in the therapy of pulmonary arterial hypertension (PAH). Ambrisentan has been associated with a low rate of serum enzyme elevations during therapy, but has yet to be implicated in cases of clinically apparent acute liver injury."}]