(3S)-1-{[(3,5-dimethylisoxazol-4-yl)amino]carbonyl}-4,4-dimethylpyrrolidin-3-yl {(1S)-1-[1-hydroxy-2-oxo-2-{[(1R)-1-phenylethyl]amino}ethyl]pentyl}carbamate
(3s)-1-{[(3,5-dimethylisoxazol-4-yl)amino]carbonyl}-4,4-dimethylpyrrolidin-3-yl {(1s)-1-[1-hydroxy-2-oxo-2-{[(1r)-1-phenylethyl]amino}ethyl]pentyl}carbamate