[{"from": "human", "value": "Provide a description of this molecule. [C][C][C][C][Branch1][#C][C][C][/C][=C][/C][=C][/C][#C][C][#C][/C][=C][/C][O][O]"}, {"from": "gpt", "value": "The molecule is a plant toxin found in hemlock water dropwort (Oenanthe crocata) and other plants of the genus Oenanthe. It is a central nervous system poison and acts as a non-competitive gamma-aminobutyric acid antagonist. (L1243)"}]