You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 6-[4-bromo-3-(oxan-2-yloxymethyl)pyridin-2-yl]-7,8-dihydro-1,6-naphthyridin-5-one ?
user
C19H20BrN3O3
assistant