You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4E)-4-[(6-bromo-1,3-benzodioxol-5-yl)methylidene]-2-(4-ethylphenyl)-1,3-oxazol-5-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H14BrNO4
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