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 2-[hydroxy-[(8S,9R,10S,13S,14S)-17-hydroxy-13-methyl-3-oxo-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-10-yl]methoxy]acetic acid .
user
C21H30O6
assistant