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 5-chloro-4-[(2Z)-2-[[3-methoxy-4-[(2-methylphenyl)methoxy]-5-nitrophenyl]methylidene]hydrazinyl]-1H-pyridazin-6-one ?
user
C20H18ClN5O5
assistant