You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 1-[4-(5-cyclobutyl-1,2,4-oxadiazol-3-yl)phenyl]-3-methyl-N-(5-methyl-1,2-oxazol-3-yl)pyrazole-4-carboxamide into molecular formula.
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C21H20N6O3
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