You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-(1,3-benzodioxol-5-ylmethyl)piperazin-1-yl]-[6-methyl-2-(propylamino)pyrimidin-4-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H27N5O3
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