RT Journal Article SR Electronic T1 Utility of trace trifluoroacetic acid to enhance the quality of proton NMR spectra of xenobiotic metabolites. JF Drug Metabolism and Disposition JO Drug Metab Dispos FD American Society for Pharmacology and Experimental Therapeutics SP 1004 OP 1006 VO 23 IS 9 A1 G Y Kuo A1 D M Dulik YR 1995 UL http://dmd.aspetjournals.org/content/23/9/1004.abstract AB