You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[[6-[2-(4-bromophenyl)-1-(pyridin-2-ylsulfonylamino)ethyl]pyridin-2-yl]-[(2-methylpropan-2-yl)oxycarbonyl]amino]acetic acid by IUPAC nomenclature, provide its molecular formula.
user
C25H27BrN4O6S
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