You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (3E)-6-chloro-3-[(3-ethoxy-4-hydroxyphenyl)methylidene]-1,2-dihydropyrrolo[2,1-b]quinazolin-9-one .
user
C20H17ClN2O3
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