You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(8S,9S,11S,13S,14S)-11-hydroxy-13-methyl-3-phenylmethoxy-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthren-17-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H28O3
assistant