You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-chloro-2-[2-[(2-fluorophenyl)methyl-[2-(1H-indol-3-yl)ethyl]amino]-2-oxoethoxy]benzoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H22ClFN2O4
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