The molecule is a 3-sn-phosphatidyl-L-serine in which the phosphatidyl acyl groups at positions 1 and 2 are specified as oleoyl and stearoyl respectively. It derives from an oleic acid and an octadecanoic acid. It is a conjugate acid of a 1-oleoyl-2-stearoyl-sn-glycero-3-phospho-L-serine(1-).
(2S)-2-amino-3-[hydroxy-[(2R)-2-octadecanoyloxy-3-[(Z)-octadec-9-enoyl]oxypropoxy]phosphoryl]oxypropanoic acid