You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-methylpropyl N-[4-[7-amino-3-[3-(4-methylsulfonylpiperazin-1-yl)phenyl]pyrazolo[1,5-a]pyrimidin-6-yl]phenyl]carbamate by IUPAC nomenclature, provide its molecular formula.
user
C28H33N7O4S
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