You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S)-1-oxo-1-[(1,3,5-trimethylpyrazol-4-yl)amino]propan-2-yl] 4-(3,4-dimethylphenyl)-4-oxobutanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H27N3O4
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