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CAS 428839-65-0 appears in our catalog under these names: [(4-Ethyl-8-methyl-2-oxo-2h-chromen-7-yl)oxy]acetic acid, 95%, 2-((4-Ethyl-8-methyl-2-oxo-2H-chromen-7-yl)oxy)acetic acid, 97%. Offered by: Combi-blocks, AmBeed. Available pack sizes: 1g, 5g.