You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(2,3-dihydro-1-benzofuran-5-yl)-1-(4-pyrimidin-2-ylpiperazin-1-yl)prop-2-en-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H20N4O2
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