[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a methyl-branched fatty acid that is pentadecanoic acid substituted by a methyl group at position 13. It has a role as a Caenorhabditis elegans metabolite and a mammalian metabolite. It is a long-chain fatty acid, a methyl-branched fatty acid and a saturated fatty acid."}, {"from": "gpt", "value": "[C][C][C][Branch1][C][C][C][C][C][C][C][C][C][C][C][C][C][C][=Branch1][C][=O][O]"}]