You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-(diaminomethylidene)-3-[[3-[2-(2,4-dioxo-1,3,8-triazaspiro[4.5]decan-8-yl)pyrimidin-5-yl]phenyl]methyl]urea into its molecular formula.
user
C20H23N9O3
assistant