You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 4-[4-[(1,3-dioxo-2-azaspiro[4.5]decan-2-yl)methyl]piperazin-1-yl]sulfonylbenzamide ?
user
C21H28N4O5S
assistant