You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 3-[[[4-(5-bromo-4-methoxypyrimidin-2-yl)piperazin-1-yl]-(ethylamino)methylidene]amino]propanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H25BrN6O3
assistant