You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-(6-ethyl-4-oxothieno[2,3-d]pyrimidin-3-yl)-N-[(E)-(3-methoxy-4-propan-2-yloxyphenyl)methylideneamino]acetamide .
user
C21H24N4O4S
assistant