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 2-[2-[(4-bromo-1H-imidazol-5-yl)methylsulfanyl]ethylamino]-5-(2-phenylethyl)-1H-pyrimidin-6-one .
user
C18H20BrN5OS
assistant