You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(5-cyano-2,4-dimethyl-6-oxo-1H-pyridin-3-yl)-N-[(4-hydroxy-3-methoxyphenyl)methyl]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H21N3O4
assistant