[{"from": "human", "value": "Describe this molecule. [C][C][C@H1][Branch1][C][C][C@H1][Branch2][Ring1][#Branch1][C][/C][=C][/C][Branch1][C][C][C][C@H1][Branch1][O][C@@H1][Branch1][Ring1][C][C][C][=Branch1][C][=O][O-1][O][O][C]"}, {"from": "gpt", "value": "The molecule is the conjugate base of methoxymycolic acid type-2 (VIII). A class of mycolic acids characterized by the presence of a proximal alkenyl group with a trans C=C double bond and a distal (CH-CH3)-(CHO-CH3) fragment of (S,S) stereochemistry in the meromycolic chain."}]