You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3,4-dihydro-2H-chromen-2-yl-[4-(2-pyrrolidin-1-ylpyrimidin-4-yl)piperazin-1-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H27N5O2
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