You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-acetamido-N-[[5-(1,1-difluoropropoxy)-6-fluorocyclohexa-2,4-dien-1-yl]methyl]-2,3-dihydropyridine-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H22F3N3O3
assistant