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 2-(5-cyano-3,4-diethyl-6-oxopyridazin-1-yl)-N-[(3,4-dichlorophenyl)methyl]-N-methylacetamide .
user
C19H20Cl2N4O2
assistant