You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-[2-(2,4-dimethylanilino)-1,3-thiazole-4-carbonyl]piperazin-1-yl]-(furan-2-yl)methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H22N4O3S
assistant