You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[5-[[2-(2-hydroxyethyl)-3-methyl-7,9-dioxo-6,8-diphenyl-1-thia-4,6,8-triazaspiro[4.4]non-2-en-4-yl]methyl]-2-methylpyrimidin-4-yl]-3-phenylurea is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H31N7O4S
assistant