[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a retinoid that consists of all-trans-retinoic acid carrying an oxo substituent at position 4 and a hydroxy substituent at position 18. It is a retinoid, an enone, a hydroxy monocarboxylic acid and an oxo monocarboxylic acid. It is functionally related to an all-trans-retinoic acid. It is a conjugate acid of an all-trans-4-oxo-18-hydroxyretinoate."}, {"from": "gpt", "value": "[C][/C][=Branch1][=C][=C][\\C][=C][\\C][=Branch1][#Branch1][=C][\\C][=Branch1][C][=O][O][\\C][/C][=C][/C][=C][Branch1][=C][C][=Branch1][C][=O][C][C][C][Ring1][#Branch1][Branch1][C][C][C][C][O]"}]