You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(1-benzyl-5-chloro-6-oxopyridazin-4-yl)-methylamino]-N-(2,6-dimethylphenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H23ClN4O2
assistant