You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[4-(3-cyclopropyl-[1,2,4]triazolo[4,3-c]quinazolin-5-yl)-1,4-diazepan-1-yl]-2-methylpropan-1-one .
user
C21H26N6O
assistant