is protonated form of acylglycerophosphoserine lysophosphatidylserine(1-) lysophosphatidylserine An acylglycerophosphoserine resulting from partial hydrolysis of a phosphatidylserine, which removes one of the fatty acid groups. The structure is depicted in the image where R1 = acyl, R2 = H or where R1 = H, R2 = acyl. Formula C7H13NO9PR, where R represents the hydrocarbon chain of the fatty acyl group.