4-Hydroxy-1,5-naphthyridine-3-carboxylic acid, 1,5-Naphthyridine-3-carboxylicacid, 4-hydroxy, 1,5-Naphthyridine-3-carboxylic acid, 4-hydroxy, 4-Hydroxy-1,5-naphthyridine-3-carboxylicacid
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