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 (11S,17R)-17-[(1R)-1,2-dihydroxyethyl]-11,17-dihydroxy-10,13-dimethyl-2,4,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthren-3-one .
user
C21H32O5
assistant