You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (5R,8S,9R,10S,11S,13S,14S,17S)-9-fluoro-11,17-dihydroxy-10,13,17-trimethyl-1,2,4,5,6,7,8,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-3-one into molecular formula.
user
C20H31FO3
assistant