You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[2-(dimethylamino)-2-(4-methoxyphenyl)ethyl]-2-(2-pyridin-4-yl-1,3-thiazol-4-yl)acetamide into molecular formula.
user
C21H24N4O2S
assistant