You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-cyclopentyl-1-[4-[5,6-dimethyl-2-(2-phenylethyl)thieno[2,3-d]pyrimidin-4-yl]piperazin-1-yl]propan-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H36N4OS
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