Fosamprenavir Calcium Standard

Fosamprenavir Calcium Salt; Calcium (2R,3S)-1-((4-amino-N-isobutylphenyl)sulfonamido)-4-phenyl-3
-(((((S)-tetrahydrofuran-3-yl)oxy)carbonyl)amino)butan-2-yl Phosphate;Carbamic acid, [(1S,2R)-3-[[(4-aminophenyl)sulfonyl](2-methylpropyl)amino]-1-(phenylmethyl)-2-(phosphonooxy)propyl]-, C-[(3S)-tetrahydro-3-furanyl] ester, calcium salt (1:1); (3S)-Tetrahydro-3-furyl [(αS)-α-[(1R)-1-hydroxy-2-(N1-isobutylsulfanilamido)ethyl]phenethyl]carbamate, calcium phosphate (ester) (1:1); Calcium (2R,3S)-1-[(4-amino-N-isobutylphenyl)sulfonamide]-4-phenyl-3-[({[(S)-tetrahydrofuran-3-yl]oxy}carbonyl)amino]butan-2-yl phosphate (USP)