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Threo-dihydrobupropion is a major metabolite of Bupropion, formed via oxidation and reduction exhibit pharmacological activity. Bupropion, a dual dopamine-norepinephrine uptake inhibitor and a nicotine receptor antagonist, is widely used in the management of depression and as a smoking cessation aid[1].

[1] Andrea R Masters, et al. Stereoselective method to quantify bupropion and its three major metabolites, hydroxybupropion, erythro-dihydrobupropion, and threo-dihydrobupropion using HPLC-MS/MS. J Chromatogr B Analyt Technol Biomed Life Sci. 2016 Mar 15;1015-1016:201-208. DOI:10.1016/j.jchromb.2016.02.018