Methyl 6-bromo-2-oxo-2,3,4,8-tetrahydro-1,8-naphthyridine-3-carboxylate;methyl 6-bromo-2-oxo-1,2,3,4-tetrahydro-1,8-naphthyridine-3-carboxylate;Methyl 6-bromo-2-oxo-2,3,4,8-tetrahydro-1,8-naphthyridine-3-carboxylate;
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