You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[[4-(2-hydroxyacetyl)phenyl]methyl]-2,6-dimethyl-N-pyridin-2-ylmorpholine-4-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C21H25N3O4
assistant