You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3Z)-N-[4-(difluoromethyl)phenyl]-3-hydrazinylidene-1-(6-pyrazin-2-ylpyridazin-3-yl)oxybutan-2-imine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H17F2N7O
assistant