The molecule is a 1-acyl-sn-glycero-3-phospho-(1'-sn-glycerol)(1-) in which the acyl group is specified as octadecanoyl (stearoyl); major species at pH 7.3. It is a conjugate base of a 1-octadecanoyl-sn-glycero-3-phospho-(1'-sn-glycerol).
[(2S)-2,3-dihydroxypropyl] [(2R)-2-hydroxy-3-octadecanoyloxypropyl] phosphate