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(a) Representative high-performance liquid chromatography elution profile of chloroform extracts of human urine collected after a single 250-mg oral dose of chlorpropamide. (b) Electrospray mass spectrum (positive-ion mode) and structure of 2-OH-chlorpropamide. Mass peaks with m/z 292.9 and 314.8 correspond to MH+ and [M + Na+] adduct ions, respectively. Experimental conditions were as described under Methods
