... :11beta,16alpha,17,21-Tetrahydroxypregna-1,4-diene-3,20-dioneFormula: C21H28O6Synonyms: Pregna-1,4-diene-3,20-dione,11b,16a,17 ... ,7CI,8CI);16a-Hydroxyprednisolone;16α-hydroxy-prednisonlone;Pregna-1,4-diene-3,20-dione,11,16,17,21-tetrahydroxy-, (11b,16a ...