You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 3-[4-(7-bromo-4-morpholin-4-yl-5,11-dihydropyrido[3,2-c][1,5]benzoxazepin-9-yl)pyrazol-1-yl]azetidine-1-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H31BrN6O4
assistant