You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2,4-dioxo-1,3-diazaspiro[4.5]decan-3-yl)-2-(4-oxo-3-propan-2-ylquinazolin-2-yl)sulfanylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H25N5O4S
assistant