phosphoseryl-phosphoserine 21: PN: WO03093314 PAGE: 45 claiMed protein N-(O-Phosphono-L-seryl)-L-serine Dihydrogen Phosphate (Ester) N-L-Seryl-L-serine Bis(dihydrogen phosphate) O-Phosphono-L-seryl-O-phosphono-L-serine PN: WO2010142041 SEQID: 15 claiMed protein L-Serine, O-phosphono-L-seryl-O-phosphono-