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 1-[(3S,8S,9S,10S,13S,14S,17S)-3-hydroxy-10-(hydroxymethyl)-13-methyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl]ethanone .
user
C21H32O3
assistant