[NH2:1][C@H:2]([C:10]([OH:12])=[O:11])[CH2:3][CH2:4][CH2:5][NH:6][C:7](=[NH:9])[NH2:8].[OH:13][P:14]([F:17])([OH:16])=[O:15].O.CO>C(O)C>[P:14]([F:17])([OH:16])([OH:15])=[O:13].[NH2:1][C@H:2]([C:10]([OH:12])=[O:11])[CH2:3][CH2:4][CH2:5][NH:6][C:7](=[NH:8])[NH2:9]L-arginine monofluorophosphate was prepared by combining 34.8 gm. of free-base L-arginine with 20 gm. of monofluorophosphoric acid in about 75 ml. of water. The resulting clear syrup was poured into 750 ml. of a mixture of methanol and ethanol. This was allowed to stand over night and the salt was collected by filtration. The resulting L-arginine monofluorophosphate was then rinsed with methanol and air dried.
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