Afatinib N-Oxide, an impurity resulting from the oxidative degradation of Afatinib, is an irreversible inhibitor of the EGFR (Epidermal Growth Factor Receptor) family.
Brexpiprazole S-oxide (DM-3411), a primary metabolite of Brexpiprazole, acts as a partial agonist of human 5-HT1A and dopamine receptors with Ki values of 0.12 nM and 0.3 nM, respectively.
Dofetilide N-oxide (UK-116856), a metabolite of dofetilide, is associated with the parent compound's ability to block potassium channels, categorizing it as a tertiary antiarrhythmic drug.
Emtricitabine, a potent nucleoside reverse transcriptase inhibitor, is employed for managing HIV infection. Emtricitabine S-oxide, also known as Emtricitabine sulfoxide, represents a significant degradation byproduct of Emtricitabine.