You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-N-[4-(4-methylpiperazin-1-yl)-3-(1,2,4-triazol-4-yl)phenyl]imidazo[1,2-b]pyridazine-3,6,8-triamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H23N11
assistant