You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4E)-1-(1H-benzimidazol-2-yl)-5-(3-ethoxy-4-hydroxyphenyl)-4-[hydroxy(naphthalen-1-yl)methylidene]pyrrolidine-2,3-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H23N3O5
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