You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3-methyl-1-benzofuran-2-yl)-[3-[(4-methyl-1H-pyrazol-5-yl)methyl]piperidin-1-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H23N3O2
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