You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,24R,27S)-27-[2-(6-bromo-3-methylpyridin-2-yl)acetyl]-16-(2-methylpyrimidin-5-yl)-18-(2-oxopropanimidoyl)-3-oxa-20,23,28-triazapentacyclo[21.2.2.14,8.01,24.014,19]octacosa-4,6,8(28),10,14(19),15,17-heptaen-22-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C40H40BrN7O4
assistant