You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-[3-[1H-imidazol-5-ylmethyl(methyl)amino]phenyl]-N-(2-methylpropyl)-2-oxo-1H-pyridine-3-carboxamide is given. What is its corresponding molecular formula?
user
C21H25N5O2
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