You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (Z)-2-cyano-3-[1-(3,4-dimethoxyphenyl)ethylamino]-N-(2-piperazin-1-ylethyl)prop-2-enamide .
user
C20H29N5O3
assistant