This enzyme belongs to the family of oxidoreductases, specifically those acting on diphenols and related substances as donor with other acceptors. The systematic name of this enzyme class is 1-(beta-D-ribofuranosyl)-1,4-dihydronicotinamide:quinone oxidoreductase. Other names in common use include NRH:quinone oxidoreductase 2, NQO2, NQO2, NAD(P)H:quinone oxidoreductase-2 (misleading), QR2, quinone reductase 2, N-ribosyldihydronicotinamide dehydrogenase (quinone), and NAD(P)H:quinone oxidoreductase2 (misleading).
LIAO S, DULANEY JT, WILLIAMS-ASHMAN HG (1962). "Purification and properties of a flavoprotein catalyzing the oxidation of reduced ribosyl nicotinamide". J. Biol. Chem. 237: 2981–7. PMID14465018.