You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[(E)-4-(dimethylamino)but-2-enoyl]amino]-N-[3-[[4-[4-[2-(6-methylpyridin-3-yl)oxyethoxy]indol-1-yl]pyrimidin-2-yl]amino]phenyl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C39H38N8O4
assistant