You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[(2-morpholin-4-ylphenyl)methyl]-2-(3-oxo-6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-2-yl)acetamide into its molecular formula.
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C20H27N5O3
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