(8S,9S,10R,11S,13S,14S)-11-hydroxy-17-(2-hydroxyacetyl)-10,13-dimethyl-6,7,8,9,10,11,12,13,14,15-decahydro-3H-cyclopenta[a]phenanthren-3-one;(11?)-11,21-Dihydroxypregna-1,4,16-triene-3,20-dione; (8S,9S,10R,11S,13S,14S)-11-Hydroxy-17-(2-hydroxyacetyl)-10,13-dimethyl-6,7,8,9,10,11,12,13,14,15-decahydro-3H-cyclopenta[a]phenanthren-3-one; Prednisolone Impurity;11?,21-dihydroxypregna-1,4,16-triene-3,20-dione
