You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 4-[(3R,5R)-3-hydroxy-10,13-dimethyl-12-oxo-1,2,3,4,5,6,7,8,9,11,14,15,16,17-tetradecahydrocyclopenta[a]phenanthren-17-yl]pentanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H40O4
assistant