You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-[[3-[5-[[1-(2-methylsulfonylethyl)piperidin-4-yl]methoxy]pyrimidin-2-yl]phenyl]methyl]-2-oxopyrimido[1,2-a]benzimidazole-7-carbonitrile into molecular formula.
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C31H31N7O4S
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