You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[4-[(3-methoxyazetidin-1-yl)methyl]naphthalen-1-yl]oxypyridine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H21N3O3
assistant