You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-chloro-5-(trifluoromethyl)pyridin-2-yl]-N-(4-morpholin-4-ylphenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H17ClF3N3O2
assistant