[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][C][C][C][C][C][C][C][=C][C][C][C][C][C][C][C][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is an octadecenoate in which the double bond is at C-9. It is a conjugate base of an octadec-9-enoic acid."}]