The molecule is an anionic phospholipid obtained by deprotonation of the carboxy and phosphate groups of N-hexadecanoyl-O-(1-octadecanoyl-sn-glycero-3-phospho)-L-serine; major species at pH 7.3. It is a conjugate base of a N-hexadecanoyl-O-(1-octadecanoyl-sn-glycero-3-phospho)-L-serine.
(2S)-2-(hexadecanoylamino)-3-[[(2R)-2-hydroxy-3-octadecanoyloxypropoxy]-oxidophosphoryl]oxypropanoate