You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[[(E)-4-(9H-fluoren-9-ylmethoxycarbonylamino)but-2-enoyl]amino]-3-methoxypropanoic acid by IUPAC nomenclature, provide its molecular formula.
user
C23H24N2O6
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