You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [2-[(8R,9S,10R,13S,14S,17R)-17-hydroxy-10,13-dimethyl-3-oxo-2,6,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthren-17-yl]-2-oxoethyl] 4-[2-[(4S)-2,2-dimethyl-4-phenyloxan-4-yl]ethylamino]-4-oxobutanoate by IUPAC nomenclature, provide its molecular formula.
user
C40H55NO7
assistant