Synonyms: Pregna-1,4-diene-3,11,20-trione, 16,17,21-trihydroxy-, (16α)- (ACI), (16α)-16,17,21-Trihydroxypregna-1,4-diene-3,11,20-trione (ACI), Pregna-1,4-diene-3,11,20-trione, 16α,17,21-trihydroxy- (6CI, 7CI, 8CI), 16a,17,21-Trihydroxy-pregna-1,4-diene-3,11,20-trione, 16α-Hydroxy-11-keto Prednisolone, (8S,9S,10R,13S,14S,16R,17S)-16,17-Dihydroxy-17-(2-hydroxyacetyl)-10,13-dimethyl-7,8,9,10,12,13,14,15,16,17-decahydro-3H-cyclopenta[a]phenanthrene-3,11(6H)-dione), 16α,17,21-Trihydroxypregna-1,4-diene-3,11,20-trione