You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-(4-ethylphenyl)-2-oxoethyl]sulfanyl-3-phenyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H24N2O2S2
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