You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3E)-1-[(3,4-dimethoxyphenyl)methyl]-3-[(1-methyl-2-phenylpyrrolo[2,3-b]pyridin-3-yl)methylidene]pyrrolidin-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H27N3O3
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