You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 6-[2-(3-butyl-5-methyl-1,2-oxazol-4-yl)ethyl]-N-(oxolan-3-yl)pyridine-3-carboxamide into molecular formula.
user
C20H27N3O3
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