You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[3-[(3,4-dimethylphenoxy)methyl]-3-hydroxypiperidin-1-yl]-N-(1-methylpyrazol-4-yl)acetamide into molecular formula.
user
C20H28N4O3
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