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 (3R,8S,9R,10R,13S,14R,17R)-3-hydroxy-10,13-dimethylspiro[1,2,3,8,9,11,12,14,15,16-decahydrocyclopenta[a]phenanthrene-17,5'-oxolane]-2'-one .
user
C22H30O3
assistant