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HPLC chromatograms obtained after extraction of ointment samples under optimal conditions: (a) nonspiked sample, (b) sample spiked with steroid drugs at concentration of 10 ng/g and (c) sample spiked with steroid drugs at concentration of 25 ng/g. Peak identification: (1) clobetasol propionate, (2) desoxycorticosterone and (3) fluorometholone.
