You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-[3-[(3Z)-2-[6-(difluoromethyl)pyridin-3-yl]imino-3-hydrazinylidenebutoxy]-6,8-dihydro-5H-pyrido[3,4-c]pyridazin-7-yl]ethanone .
user
C19H21F2N7O2
assistant