You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 4-[[4-(4-chlorophenyl)imino-5,7a-dihydro-2H-furo[2,3-d]pyridazin-7-yl]oxymethyl]pyridine-2-carboxamide into its molecular formula.
user
C19H16ClN5O3
assistant