You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(3-hydroxy-10,13-dimethyl-16-sulfanyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl)ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H32O2S
assistant