Prednisolone Base 

CAS:50-24-8 

English Name:  11-beta,17-alpha,21-trihydroxypregna-1,4-diene-3,20-dione; 11,17,21-trihydroxypregna-1,4-diene-3,20-dione; (11beta)-11,17-dihydroxy-3,20-dioxopregna-1,4-dien-21-yl acetate 

It belongs to Hormones APIs.