You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(4-fluorophenyl)-5-methylpyrazol-3-yl]-2-(2-methylquinazolin-4-yl)sulfanylacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H18FN5OS
assistant