You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 2-amino-4-(3-ethoxy-4-methoxyphenyl)-7-methyl-5-oxo-4,6-dihydropyrano[3,2-c]pyridine-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H24N2O6
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