You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-1-(4-ethylphenyl)-2-[(2-methyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-yl)sulfanyl]propan-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H24N2OS2
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