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 2-(8-methyl-2,4-dioxo-1,3-diazaspiro[4.5]decan-3-yl)-N-[2-(4-methylphenoxy)ethyl]acetamide ?
user
C20H27N3O4
assistant