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To address the question whether this phenomenological lack of stereoselectivity is also reflected in equal plasma con- centrations of (R)- and (S)-PPC metabolites, (R)/(S) ratios and enantiomeric excesses of all the metabolites between 0 and 144 h after administration were determined for three CYP2C9*1/*1 and two *3/*3 allele carriers by the method described above¡£ The enantiomeric excesses of the known (R)-4¡ä-, (R)-6-, and (R)-7-hydroxyl- ated metabolites are consistently greater for CYP2C9*3/*3 allele carriers. This (R) enantiomer excess increases markedly with time. Moderate (S) enantiomer excess for the major 4¡ä- and 7-hydroxylation pathways is initially found for CYP2C9 wild-type subjects ¡£To a minor extent this is true for the CYP2C9 variant allele carriers also |
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