You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 2-[3-(methylamino)-2-oxopyridin-1-yl]-N-(1,7,7-trimethyl-2-bicyclo[2.2.1]heptanyl)acetamide ?
user
C18H27N3O2
assistant