You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name methyl 2-[3-[2-[3-methoxy-4-(1,3-oxazol-5-yl)anilino]oxyethynoxyamino]phenyl]acetate into its molecular formula.
user
C21H19N3O6
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