You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-(2-methylphenyl)ethyl]-2-[3-(2-methylpropyl)-4-oxopyrido[2,3-d]pyrimidin-2-yl]sulfanylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
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C22H26N4O2S
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