You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule [1-[2-[(3-methyl-5,11-dihydro-[1]benzoxepino[3,4-d]pyrimidin-1-yl)amino]ethyl]piperidin-3-yl]methanol ?
user
C21H28N4O2
assistant