lysophosphatidylserine(1-) An anionic phospholipid obtained by deprotonation of the phosphate and carboxy groups and protonation of the amino group of any lysophosphatidylserine; major species at pH 7.3. The structure is depicted in the image where R(1) = acyl, R(2) = H or where R(1) = H, R(2) = acyl. lysophosphatidylserine monoacylglycero-3-phospho-L-serine(1-)