[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a cationic sphingoid that is the conjugate acid of hexadecasphinganine, obtained by protonation of the primary amino function; major species at pH 7.3. It is a conjugate acid of a hexadecasphinganine."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][C@H1][Branch1][#Branch1][C@H1][Branch1][Ring1][C][O][NH3+1][O]"}]