[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a sphingoid that is hexadecasphinganine substituted at position 15 by a methyl group. It is a sphingoid and an aminodiol. It is a conjugate base of a 15-methylhexadecasphinganine(1+)."}, {"from": "gpt", "value": "[C][C][Branch1][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]"}]