[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a sphingoid that is C16 sphinganine bearing an additional 4R-hydroxy substituent. It is functionally related to a hexadecasphing-4-enine. It is a conjugate base of a C16 phytosphingosine(1+)."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C@H1][Branch1][O][C@H1][Branch1][#Branch1][C@H1][Branch1][Ring1][C][O][N][O][O]"}]