2-dehydro-D-glucose + L-leucine => (2S)-4-methyl-2-[(E)-{[(2R,3S,4R,5R)-2,3,4,5-tetrahydroxyoxan-2-yl]methylidene}amino]pentanoate + H2O + H(+)
2-dehydro-d-glucose + l-leucine => (2s)-4-methyl-2-[(e)-{[(2r,3s,4r,5r)-2,3,4,5-tetrahydroxyoxan-2-yl]methylidene}amino]pentanoate + h2o + h(+)