750-MHZ DIRECTLY COUPLED HPLC-NMR - APPLICATION TO THE SEQUENTIAL CHARACTERIZATION OF THE POSITIONAL ISOMERS AND ANOMERS OF 2-FLUOROBENZOIC, 3-FLUOROBENZOIC, AND 4-FLUOROBENZOIC ACID GLUCURONIDES IN EQUILIBRIUM MIXTURES - SIDELMANN,UG; GAVAGHAN,C; CARLESS,HAJ; SPRAUL,M; HOFMANN,M; LINDON,JC; WILSON,ID; NICHOLSON,JK (ANALYTICAL CHEMISTRY, 1995)