You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
10-(methoxymethyl)-3,13-dimethyl-17-methylidene-1,2,3,4,5,6,7,8,9,11,12,14,15,16-tetradecahydrocyclopenta[a]phenanthrene is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H36O
assistant