You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S,4R)-1-[(2R,3S)-3-(9H-fluoren-9-ylmethoxycarbonylamino)oxolane-2-carbonyl]-4-hydroxypyrrolidine-2-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C25H26N2O7
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