16α-Hydroxyprednisolone-d3

16α-Hydroxyprednisolone-d3 is the deuterium labeled 16α-Hydroxyprednisolone. 16α-Hydroxyprednisolone is a stereoselective metabolite of the 22(R) epimer of the glucocorticoid Budesonide (HY-13580). 16α-Hydroxyprednisolone formation is catalyzed by isoenzymes within the cytochrome P450 3A (CYP3A) subfamily. 16α-Hydroxyprednisolone formation can be inhibited by antibodies targeting the CYP3A subfamily.