You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-amino-1-[(Z)-[4-(dimethylamino)phenyl]methylideneamino]-N-(3,4-dimethylphenyl)pyrrolo[3,2-b]quinoxaline-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H27N7O
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