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 N-[4-[(2,4-dioxo-1,3-diazaspiro[4.6]undecan-3-yl)methyl]-1,3-thiazol-2-yl]-N-phenylacetamide .
user
C21H24N4O3S
assistant