CAS 843620-39-3 appears in our catalog under these names: 2-[(4-Butyl-7-methyl-2-oxo-2h-chromen-5-yl)oxy]propanoic acid, 95%, 2-((4-Butyl-7-methyl-2-oxo-2H-chromen-5-yl)oxy)propanoic acid, 97%. Offered by: Combi-blocks, AmBeed. Available pack sizes: 1g, 5g.