You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(8R,9S,13S,14S,16R,17R)-3,16,17-trihydroxy-13-methyl-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthren-6-yl]pyrrolidine-2,5-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H27NO5
assistant