You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-(2-cyclopropylacetyl)-1-[[3-(2-hydroxyethyl)phenyl]methyl]-N-methyl-2-oxopyridine-3-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C21H24N2O4
assistant