You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2E,4E)-1-[4-(2,3-dihydro-1,4-benzodioxine-6-carbonyl)piperidin-1-yl]hexa-2,4-dien-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H23NO4
assistant