(+)-3-(3,4-dimethoxyphenyl)-6-[(5,6-dimethoxyphenethyl)methylamino]hexane-3-carbonitrile

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Both isomers inhibit the p-glycoprotein efflux pump in multidrug resistant tumor cells

ChEBI: A 2-(3,4-dimethoxyphenyl)-5-{[2-(3,4-dimethoxyphenyl)ethyl](methyl)amino}-2-(propan-2-yl)pentanenitrile that has R configuration. It competitively inhibits the multidrug resistance efflux pump P-glycoprotein (MDR-1, EC 3.6.3.44), thereby p tentially increasing the effectiveness of a wide range of antineoplastic drugs which are inactivated by MDR-1 mechanisms. Dexverapamil exhibits lower calcium antagonistic activity and toxicity than racemic verapamil.