Fluorinated and deoxygenated glycosides as mechanistic probes of Escherichia coli (lacZ) B-galactosidase. By use of the slow substrate 2,4-dinitrophenyl-2-deoxy-2-fluoro-B-D-galactopyranoside, a glycosyl enzyme intermediate has been trapped on the enzyme.Form:Off-White to Pale Yellow SolidMelting Point:168-170°CSolubility:Methanol