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 (E)-3-(2-chloroimidazo[1,2-a]pyridin-3-yl)-N-[furan-2-yl(phenyl)methyl]prop-2-enamide .
user
C21H16ClN3O2
assistant