You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2-cyanoethyl)-N-methyl-3-[[2-(4-oxo-2-piperidin-1-yl-1,3-thiazol-5-yl)acetyl]amino]benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H25N5O3S
assistant