[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a cationic sphingoid that is the conjugate acid of 4-hydroxysphing-8-enine, obtained by protonation of the primary amino function; major species at pH 7.3. It is a conjugate base of a 4-hydroxy-8-sphingenine."}, {"from": "gpt", "value": "[C][C][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][NH3+1][O][O]"}]