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Name the molecular formula for the molecule established as ethyl 2-(6-bromo-4-chloro-7-methoxyindazol-2-yl)-2-[(6R)-6-fluoro-6,7-dihydro-5H-pyrrolo[1,2-c]imidazol-1-yl]acetate using the IUPAC nomenclature.
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C18H17BrClFN4O3
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