You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (2S,3S,5S,8R,9S,10S,13S,14S)-3-hydroxy-10,13-dimethyl-2-(2,2,2-trifluoroethoxy)-1,2,3,4,5,6,7,8,9,11,12,14,15,16-tetradecahydrocyclopenta[a]phenanthren-17-one .
user
C21H31F3O3
assistant