You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (10R,13S,17R)-10,13-dimethyl-3-methylidene-17-prop-1-en-2-yl-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthrene by IUPAC nomenclature, provide its molecular formula.
user
C23H34
assistant