You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-methyl-5-[3-[[(3-phenyl-[1,2,4]triazolo[4,3-b]pyridazin-6-yl)amino]methyl]phenyl]imidazolidine-2,4-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H19N7O2
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