[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a cationic sphingoid that is the conjugate acid of C20 3-dehydrosphinganine, obtained by protonation of the primary amino function; major species at pH 7.3. It is a conjugate acid of a C20 3-dehydrosphinganine."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][=Branch1][C][=O][C@H1][Branch1][Ring1][C][O][NH3+1]"}]