You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(8S,9R,10R,13S,14R)-11-hydroxy-10,13-dimethyl-15,16-dimethylidene-17-oxo-1,2,3,4,7,8,9,11,12,14-decahydrocyclopenta[a]phenanthren-3-yl] acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H30O4
assistant