1 CZ7 ({[(2r)-2-{[(4-ethyl-2,3-dioxo-3,4-dihydropyrazin-1(2h)-yl)carbonyl]amino}-2-(4-hydroxyphenyl)acetyl]amino}methyl)boronic acid 1.000 2 3Y6 3-[(2r)-2-(dihydroxyboranyl)-2-{[(2r)-2-{[(4-ethyl-2,3-dioxo-3,4-dihydropyrazin-1(2h)-yl)carbonyl]amino}-2-(4-hydroxyphenyl)acetyl]amino}ethyl]benzoic acid 0.737