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(-)-Cephaeline dihydrochloride is an enantiomer of Cephaeline dihydrochloride. Cephaeline dihydrochloride is a selective CYP2D6 inhibtor with IC50 of 121 μM.

CYP2D6 reveals the highest metabolic activity for the generation of 9-O-demethylEmetine, whereas this enzyme also shows a significant metabolic activity for the generation of Cephaeline. IC50 of Cephaeline against CYP2C9, CYP2D6 and CYP3A4 is over 1000, 121 and 1000 μM, respectively. Further experiments are performed to determine inhibition constants (Ki) for Cephaeline on the CYP2D6 and CYP3A4 activities Graphic analysis of Dixon plots at various Cephaeline concentrations for each of the two CYP enzyme assays yield Kis of 54 and 355 μM for CYP2D6 and CYP3A4, respectively[1].

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