You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-methyl-N-[(7-pyrimidin-2-yl-2,3-dihydro-1-benzofuran-2-yl)methyl]pent-2-enamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H21N3O2
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