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Procedure¡ªExtract a filtered aliquot of  Dissolution Medium£¬equivalent to about 200  ¦Ìg of dexamethasone, with three 15mL portions of chloroform. Evaporate the combined chloroform extracts on a steam bath just to dr yness, cool, and dissolve the residue in 20 mL of alcohol. Proceed as directed for  Procedure under Assay for Steroids 〈351〉, except to allow to stand in the dark for 45 minutes. Calculate the portion, in mg, of C 22H29FO5 dissolved by the formula:
                                  10£¨C/V)(Au/As)
in which V is the volume, in mL, of the aliquot extracted with chloroform.
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