You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[2-[1-(5',7'-dimethylspiro[piperidine-4,4'-pyrrolo[1,2-a]quinoxaline]-1-yl)ethenyl]-6-methylphenyl]ethanimine into its molecular formula.
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C28H32N4
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