You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-[(4-benzoylpiperidin-1-yl)methyl]-3-phenyl-[1,3]thiazolo[3,2-a]pyrimidin-5-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H23N3O2S
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