NADPH-dependent oxidoreductase which catalyzes the reduction of a variety of compounds bearing carbonyl groups including ketosteroids, alpha-dicarbonyl compounds, aldehydes, aromatic ketones and quinones (PubMed:18571493, PubMed:19056333). Reduces 3-ketosteroids and benzil into 3beta-hydroxysteroids and R-benzoin, respectively, in contrast to the stereoselectivity of non-primate DHRS4s which produce 3alpha-hydroxysteroids and S-benzoin (PubMed:19056333). Displays low activity toward all-trans-retinal and no activity toward 9-cis-retinal as compared to non-primate mammals (PubMed:18571493, PubMed:19056333). In the reverse reaction, catalyze the NAD-dependent oxidation of 3beta- hydroxysteroids and alcohol, but with much lower efficiency (PubMed:18571493, PubMed:19056333). Involved in the metabolism of 3beta-hydroxysteroids, isatin and xenobiotic carbonyl compounds (PubMed:18571493, PubMed:19056333). {ECO:0000269|PubMed:18571493, ECO:0000269|PubMed:19056333}. [Isoform 7]: No detected catalytic activity in vitro, possibly due to the lack of catalytic site. . [Isoform 8]: NADPH-dependent oxidoreductase which catalyzes the reduction of a variety of compounds bearing carbonyl groups including ketosteroids, alpha-dicarbonyl compounds, aldehydes, aromatic ketones and quinones. Involved in the metabolism of 3beta- hydroxysteroids, isatin and xenobiotic carbonyl compounds. Has a higher catalytic activity for xenobiotic alpha-dicarbonyl compounds, sucha as benzil, than isoform 1 and is involved in benzil detoxification. . This is the function of ENSG00000157326 (DHRS4, dehydrogenase/reductase 4).