You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[3-[2-[1-(2-oxa-7-azaspiro[3.4]octan-7-yl)ethenylamino]imidazo[1,2-b]pyridazin-6-yl]oxyphenyl]propan-2-one into its molecular formula.
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C23H25N5O3
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