You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-[[(E,2R)-5-[7-[[(4-methoxycarbonylbenzoyl)amino]-[2-(phenylmethoxycarbonylamino)acetyl]amino]-9H-fluoren-2-yl]-2-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]pent-4-enoyl]amino]-4-methylpentanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C49H54N4O11
assistant