You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[5-chloro-4-[2-[(2-chloro-4-methylphenyl)sulfonylamino]-4-(cyclobuten-1-ylcarbamoyl)phenoxy]-2-fluorophenyl]acetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H21Cl2FN2O6S
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