You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[(2R,3S)-2-(9H-fluoren-9-ylmethoxycarbonylamino)-3-phenylmethoxybutanoyl]amino]-4-methoxy-4-methylpentanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C33H38N2O7
assistant