You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 2-[methyl-[2-(2-methylthieno[2,3-e][1,3]benzothiazol-5-yl)oxyacetyl]amino]-N-(4-methylpyridin-2-yl)acetamide using the IUPAC nomenclature.
user
C21H20N4O3S2
assistant