You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-butoxy-N-[(3-chlorophenyl)methyl]-1-(2,2-dimethoxyethyl)-5-formyl-4-oxopyridine-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H27ClN2O6
assistant