1 N02 (1s,2s)-2-{[N-({[1-(tert-butoxycarbonyl)-4-ethylpiperidin-4-yl]oxy}carbonyl)-L-leucyl]amino}-1-hydroxy-3-[(3s)-2-oxopyrrolidin-3-yl]propane-1-sulfonic acid 1.000 2 B6Y (1r,2s)-2-{[N-({[1-(tert-butoxycarbonyl)-4-ethylpiperidin-4-yl]oxy}carbonyl)-L-leucyl]amino}-1-hydroxy-3-[(3s)-2-oxopyrrolidin-3-yl]propane-1-sulfonic acid 1.000 3 AVY (1r,2s)-2-{[N-({[4-benzyl-1-(tert-butoxycarbonyl)piperidin-4-yl]oxy}carbonyl)-L-leucyl]amino}-1-hydroxy-3-[(3s)-2-oxopyrrolidin-3-yl]propane-1-sulfonic acid 0.851 4 B3J (1s,2s)-2-{[N-({[4-benzyl-1-(tert-butoxycarbonyl)piperidin-4-yl]oxy}carbonyl)-L-leucyl]amino}-1-hydroxy-3-[(3s)-2-oxopyrrolidin-3-yl]propane-1-sulfonic acid 0.851 5 YMD (1r,2s)-2-((S)-2-((((4,4-dimethylcyclohexyl)oxy)carbonyl)amino)-4-methylpentanamido)-1-hydroxy-3-((S)-2-oxopyrrolidin-3-yl)propane-1-sulfonic acid 0.705 6 YMG (1s,2s)-2-((S)-2-((((4,4-dimethylcyclohexyl)oxy)carbonyl)amino)-4-methylpentanamido)-1-hydroxy-3-((S)-2-oxopyrrolidin-3-yl)propane-1-sulfonic acid 0.705