{[(2R,3S)-1-[N-(2-methylpropyl)-4-aminobenzenesulfonamido]-3-({[(3S)-oxolan-3-yloxy]carbonyl}amino)-4-phenylbutan-2-yl]oxy}phosphonic acid

{[(2R,3S)-1-[N-(2-methylpropyl)-4-aminobenzenesulfonamido]-3-({[(3S)-oxolan-3-yloxy]carbonyl}amino)-4-phenylbutan-2-yl]oxy}phosphonic acid