You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[4-[[1-(cyclopropylmethyl)aziridin-2-yl]methoxy]phenyl]-6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H26N4O
assistant