You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 2-[2-(3-acetamidopropylamino)-2-oxoethoxy]-N-(2,6-dioxopiperidin-3-yl)-N-formyl-6-methylbenzamide ?
user
C21H26N4O7
assistant