You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 1-[4-[[5-(4-bromophenyl)thieno[2,3-d]pyrimidin-4-yl]amino]phenyl]sulfonyl-3-butylurea ?
user
C23H22BrN5O3S2
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