You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-[6-[[2-(3,4-dimethoxyphenyl)acetyl]amino]-1,3-benzothiazol-2-yl]-1,3-thiazole-4-carboxamide .
user
C21H18N4O4S2
assistant