CAS 6537-46-8 appears in our catalog under these names: 1-Azaxanthone, 95%, Pranoprofen Impurity 43, 4-Azaxanthone, 97% , 5H-chromeno(2,3-b)pyridin-5-one, 5H-Chromeno[2,3-b]pyridin-5-one, 97% . Offered by: Combi-blocks, Chemat Brand, Thermo Scientific (Alfa Aesar), Biosynth, Thermo Scientific. Available pack sizes: 10g, 1g, 5g, on request, 250mg, 25g.