You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by (E)-1-(azepan-1-yl)-3-(6-chloro-3,4-dihydro-2H-1,5-benzodioxepin-8-yl)prop-2-en-1-one ?
user
C18H22ClNO3
assistant