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 2-[(3S)-1-(4-methyl-3-nitrobenzoyl)piperidin-3-yl]-5-[methyl(propan-2-yl)amino]pyridazin-3-one .
user
C21H27N5O4
assistant