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An HPLC–MS/MS method for simultaneously determination of the active metabolites (67M-1, 67M-2 and 67M-4) in human plasma using clopidogrel as the internal standard was developed and validated. The compounds were extracted by protein precipitation using acetonitrile and separated using a C8 column by a gradient elution with the mobile phase consisting of acetonitrile (containing 0.1% formic acid) and...
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