You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 2-[3-(1H-imidazol-5-yl)propyl]-1-[2-[4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)-2-nitroanilino]ethyl]guanidine ?
user
C20H27N9O3
assistant