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 (E)-3-(5-chloro-2,3-dihydro-1,4-benzodioxin-7-yl)-2-cyano-N-(2,4-dimethylphenyl)prop-2-enamide .
user
C20H17ClN2O3
assistant