You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-(9H-fluoren-9-ylmethoxycarbonylamino)-4-[methyl(3-methylbutan-2-yl)amino]-4-oxobutanoic acid by IUPAC nomenclature, provide its molecular formula.
user
C25H30N2O5
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