You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-[6-chloro-8-[(2-hydroxy-2-methylpropyl)amino]imidazo[1,2-b]pyridazin-3-yl]-2-methylphenyl]-2-cyclopropylethanone;2-cyclopropyl-1-[4-[6-(3,5-difluorophenyl)sulfanyl-8-[(2-hydroxy-2-methylpropyl)amino]imidazo[1,2-b]pyridazin-3-yl]-2-methylphenyl]ethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C50H53ClF2N8O4S
assistant