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 1-[4-chloro-5-(1-ethyl-7-methylsulfanyl-2-oxo-4H-pyrimido[4,5-d]pyrimidin-3-yl)-2-fluorophenyl]-3-[3-(trifluoromethyl)phenyl]urea .
user
C23H19ClF4N6O2S
assistant