You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[1-[2-(4-ethyl-5-oxotetrazol-1-yl)ethyl]-3-methoxypiperidin-4-yl]methoxy]-N-phenylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H30N6O4
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