You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 9H-fluoren-9-ylmethyl N-[(2S)-1-[[6-[[(2S)-2-(9H-fluoren-9-ylmethoxycarbonylamino)-3-phenylpropanoyl]amino]-1-hydroxyhexan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]carbamate by IUPAC nomenclature, provide its molecular formula.
user
C54H54N4O7
assistant