You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-bromo-1-[(3S,5R,8R,9R,10S,13S,14S,17S)-3-(fluoromethyl)-3-hydroxy-13-methyl-2,4,5,6,7,8,9,10,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]ethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H32BrFO2
assistant