You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [(3S,8R,9S,10R,13S,14S,16Z)-16-benzylidene-10,13-dimethyl-17-oxo-2,3,4,7,8,9,11,12,14,15-decahydro-1H-cyclopenta[a]phenanthren-3-yl] acetate .
user
C28H34O3
assistant