The molecule is a (2R,3S)-2-aminooctadec-4-ene-1,3-diol in which the double bond has E geochemistry. It is a conjugate base of a L-erythro-sphingosine(1+). It is an enantiomer of a sphingosine.
(E,2R,3S)-2-aminooctadec-4-ene-1,3-diol