You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-[2-(4-fluorophenyl)-[1,3]thiazolo[3,2-b][1,2,4]triazol-6-yl]ethyl]-3,4-dimethoxybenzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H19FN4O3S
assistant