Wiktionary
prednylidene
n. A glucocorticoid for systemic use.
Wikipedia
Prednylidene
Prednylidene is a glucocorticoid for systemic use.
Substitution at position 16 also leads to more potent corticosteroids. The additional steric bulk introduced by such substituents adjacent to the dihydroxyacetone side chain also protects that moiety against metabolic degradation.