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Under IUPAC nomenclature, a molecule named 4-[(2,6-dichloro-3-fluorophenyl)methyl]-5-[2-imino-2-(3-propan-2-yl-1,2,4-oxadiazol-5-yl)ethyl]-3,5-dihydro-2H-pyrazin-6-amine is given. What is its corresponding molecular formula?
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C18H21Cl2FN6O
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