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-[1-(3,4-dimethylphenyl)ethylamino]-2-oxoethyl] 6-pyrazol-1-ylpyridine-3-carboxylate into molecular formula.
user
C21H22N4O3
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