[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a monounsaturated long-chain fatty acid with a 20-carbon backbone and the sole double bond originating from the 11th position from the methyl end, with the bond in the cis- configuration."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][/C][=C][\\C][C][C][C][C][C][C][C][=Branch1][C][=O][O]"}]