You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule [3-(ethylamino)-7,8-dihydro-5H-pyrido[4,3-c]pyridazin-6-yl]-(3-methyl-1-benzofuran-2-yl)methanone ?
user
C19H20N4O2
assistant