You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-ethyl-2-[methyl(2-pyridin-4-ylethyl)amino]-4-oxo-5,6,8,9-tetrahydro-3H-pyrimido[4,5-d]azepine-7-carboxamide ?
user
C19H26N6O2
assistant