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 3-(3,4-dihydro-2H-1,5-benzodioxepin-7-yl)-1-[3-(trifluoromethyl)piperidin-1-yl]prop-2-en-1-one .
user
C18H20F3NO3
assistant