You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-[(2-chloro-6-fluorophenyl)methyl]-N,3-dimethyl-4-oxo-2-sulfanylidene-1H-quinazoline-7-carboxamide ?
user
C18H15ClFN3O2S
assistant