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-[(3R)-8-bromo-5-methyl-4-oxo-2,3-dihydro-1,5-benzoxazepin-3-yl]-3-[3-(2-imidazo[1,2-b]pyridazin-3-ylethynyl)phenyl]urea .
user
C25H19BrN6O3
assistant