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 N-[[5-(4-chlorobenzoyl)-3-ethyl-6,7-dihydro-4H-imidazo[4,5-c]pyridin-2-yl]methyl]propanamide .
user
C19H23ClN4O2
assistant