UDP-N-acetylglucosamine 4,6-dehydratase (configuration-inverting) (, FlaA1, UDP-N-acetylglucosamine 5-inverting 4,6-dehydratase, PseB, UDP-N-acetylglucosamine hydro-lyase (inverting, UDP-2-acetamido-2,6-dideoxy-ò-<small>L</small>)arabino-hex-4-ulose-forming)) is an enzyme with systematic name UDP-N-acetyl-ñ-<small>D</small>-glucosamine hydro-lyase (inverting; UDP-2-acetamido-2,6-dideoxy-ò-L-arabino-hex-4-ulose-forming). This enzyme catalyses the following chemical reaction
This enzyme contains NADP<sup>+</sup> as a cofactor.