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 (6-aminopyridazin-3-yl)-[4-methyl-4-[[[(1R)-2-phenylcyclopropyl]amino]methyl]piperidin-1-yl]methanone .
user
C21H27N5O
assistant