You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[1-[7-bromo-2-(2,2-diethoxyethylamino)pyrido[2,3-b]pyrazin-3-yl]azetidin-3-yl]-N-methylcarbamate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H33BrN6O4
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