You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-(5-methyl-4-oxo-2,3-dihydro-1,5-benzoxazepin-7-yl)-N-(pyridin-3-ylmethyl)acetamide .
user
C18H19N3O3
assistant