You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (3S,8S,9S,10R,13S,14S)-4-chloro-17-(1-fluoro-2-hydroxyethylidene)-10,13-dimethyl-1,2,3,4,7,8,9,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-3-ol ?
user
C21H30ClFO2
assistant