You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1,4-dioxa-8-azaspiro[4.5]decan-8-yl-[4-(4-methylpiperidin-1-yl)pyridin-2-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H27N3O3
assistant