[{"from": "human", "value": "Could you provide a description of this molecule? [C][C][C][C][N][Branch1][Branch1][C][C][C][C][C][=Branch1][C][=O][C][N][C][C@@H1][Branch2][Ring1][Branch2][C@H1][Branch1][S][C@@H1][Ring1][Branch1][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][O][C][C][=Branch1][C][=O][O][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][O][C][O][Ring1][#Branch1].[Cl]"}, {"from": "gpt", "value": "The molecule is the orally available hydrochloride salt of pyrrolidine-3-carboxylic acid with potential antineoplastic activity.  As a selective antagonist of the endothelin-A (ETA) receptor, atrasentan binds selectively to the ETA receptor, which may result in inhibition of endothelin-induced angiogenesis and tumor cell proliferation."}]