You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[[2-(4-bromo-3-methylphenoxy)acetyl]-[(3,4-dichlorophenyl)methyl]amino]-N-cyclohexylbutanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H31BrCl2N2O3
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