[{"from": "human", "value": "Describe this molecule. [C][=C][/C][=C][Branch1][=Branch1][\\C][=Branch1][C][=O][O][/O-1]"}, {"from": "gpt", "value": "The molecule is a 2-hydroxypenta-2,4-dienoate in which the double bond between positions 2 and 3 has E- (cis-) geometry. It is a 2-hydroxypenta-2,4-dienoate and a 2-hydroxy fatty acid anion. It is a conjugate base of a cis-2-hydroxypenta-2,4-dienoic acid."}]