(2S)-4-methyl-2-[(E)-{[(2R,3S,4R,5R)-2,3,4,5-tetrahydroxyoxan-2-yl]methylidene}amino]pentanoate + H2O2 + H(+) => N-(1-deoxy-beta-D-fructopyranos-1-yl)-L-leucine + O2
(2s)-4-methyl-2-[(e)-{[(2r,3s,4r,5r)-2,3,4,5-tetrahydroxyoxan-2-yl]methylidene}amino]pentanoate + h2o2 + h(+) => n-(1-deoxy-beta-d-fructopyranos-1-yl)-l-leucine + o2