You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (E)-N-[[6-(4-ethylpiperazin-1-yl)pyridin-3-yl]methyl]-3-pyridin-2-ylprop-2-enamide using the IUPAC nomenclature.
user
C20H25N5O
assistant