[{"from": "human", "value": "Describe this molecule. [C][C][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]"}, {"from": "gpt", "value": "The molecule is a sphing-4-enine in which the double bond is trans. It has a role as a human metabolite and a mouse metabolite. It is a conjugate base of a sphingosine(1+). It is an enantiomer of a L-erythro-sphingosine."}]