You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-benzofuran-3-yl-(3,13-dimethyl-1,2,3,4,5,6,7,8,9,10,11,12,14,15,16,17-hexadecahydrocyclopenta[a]phenanthren-17-yl)methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H36O2
assistant