The molecule is an anionic phospholipid obtained by deprotonation of the phosphate OH groups and protonation of the amino group of phytosphingosine 1-phosphate; major species at pH 7.3. It is a conjugate base of a phytosphingosine 1-phosphate.
[(2S,3S,4R)-2-azaniumyl-3,4-dihydroxyoctadecyl] phosphate