You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-(6-methyl-2-pyrrolidin-1-ylpyrimidin-4-yl)piperazin-1-yl]-(3,4,5-trimethoxyphenyl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H31N5O4
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