Identification of phenacetin metabolites in human urine after administration of phenacetin-C2H3: measurement of futile metabolic deacetylation via HPLC/MS-SPE-NMR and HPLC-ToF MS - Nicholls, AW; Wilson, ID; Godejohann, M; Nicholson, JK; Shockcor, JP (Xenobiotica, 2006)