[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is a sphingoid that is the C20 analogue of sphingosine. It has a role as a mouse metabolite. It is a sphingoid and an aminodiol. It is a conjugate base of a C20 sphingosine(1+)."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][/C][=C][/C@H1][Branch1][#Branch1][C@H1][Branch1][Ring1][C][O][N][O]"}]