[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a sphingoid that is the 3-keto analogue of sphingosine. It is an amino alcohol, an enone, a beta-hydroxy ketone and a sphingoid. It is functionally related to a sphing-4-enine and a sphingosine."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][/C][=C][/C][=Branch1][C][=O][C@H1][Branch1][Ring1][C][O][N]"}]