You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[3-methyl-4-[4-(methylamino)-3-nitro-5-(1,3,5-trimethylpyrazol-4-yl)phenyl]-1,2-oxazol-5-yl]methyl acetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H23N5O5
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