You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [4-[[4-[4-(2-hydroxyethylsulfanyl)phenyl]pyrimidin-2-yl]amino]phenyl]-piperazin-1-ylmethanone by IUPAC nomenclature, provide its molecular formula.
user
C23H25N5O2S
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