You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[3,5-dimethyl-1-(2-methylphenyl)pyrazol-4-yl]methyl]-N-methyl-2-morpholin-3-ylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H28N4O2
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