[{"from": "human", "value": "Describe this molecule. [C][C][Branch1][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][N][O][O]"}, {"from": "gpt", "value": "The molecule is a sphingoid that is 4-hydroxyhexadecasphinganine substituted at position 15 by a methyl group. It is a sphingoid, an amino alcohol and a triol. It is a conjugate base of a 4-hydroxy-15-methylhexadecasphinganine(1+)."}]