You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3'S,8'R,9'S,10'R,13'S,14'S)-3',13'-dimethylspiro[1,3-dioxolane-2,17'-2,3,4,5,6,7,8,9,10,11,12,14,15,16-tetradecahydro-1H-cyclopenta[a]phenanthrene]-6'-ol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H34O3
assistant