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 1-cyano-2-methyl-3-[4-(5-methyl-6-oxo-3-phenyl-4,5-dihydropyridazin-1-yl)butyl]guanidine ?
user
C18H24N6O
assistant