You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[(Z)-2-aminobut-1-enyl]-N-(2,8-dimethylimidazo[1,2-b]pyridazin-6-yl)-5-piperazin-1-ylpyridine-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H28N8O
assistant