[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is an undecenoic acid having its double bond in the 10-position. It is derived from castor oil and is used for the treatment of skin problems. It has a role as a plant metabolite and an antifungal drug. It is a conjugate acid of a 10-undecenoate."}, {"from": "gpt", "value": "[C][=C][C][C][C][C][C][C][C][C][C][=Branch1][C][=O][O]"}]