1 75V N-{[(2s,3s)-3-(ethoxycarbonyl)oxiran-2-yl]carbonyl}-L-isoleucyl-L-alanine 1.000 2 76V N-{[(2s,3s)-3-(ethoxycarbonyl)oxiran-2-yl]carbonyl}-L-isoleucyl-L-isoleucine 0.889 3 042 N-{[(2s,3s)-3-(ethoxycarbonyl)oxiran-2-yl]carbonyl}-L-threonyl-L-isoleucine 0.786 4 59A N-{[(2s,3s)-3-(ethoxycarbonyl)oxiran-2-yl]carbonyl}-L-isoleucine 0.720