You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named methyl N-[1-[(2S)-2-[5-[9-cyano-7-[2-[(2S)-1-[(2S)-2-(methoxycarbonylamino)-3-methylbutanoyl]pyrrolidin-2-yl]-1H-imidazol-5-yl]phenanthren-2-yl]-1H-imidazol-2-yl]pyrrolidin-1-yl]-3-methyl-1-oxobutan-2-yl]carbamate by IUPAC nomenclature, provide its molecular formula.
user
C43H49N9O6
assistant