CAS 34598-33-9 appears in our catalog under these names: 2H,2H,3H,3H-Perfluoroundecanoic acid, 95%, 4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,11-Heptadecafluoroundecanoic Acid, >95% (GC), 2H,2H,3H,3H-Perfluoroundecanoic acid, 2H,2H,3H,3H-Perfluoroundecanoic acid 50 µg/mL in Methanol, 2H,2H,3H,3H-Heptadecafluoroundecanoic Acid, >97.0%(GC)(T). Offered by: Combi-blocks, TRC, Dr. Ehrenstorfer, TCI, Ambeed. Available pack sizes: 1g, 10g, 25g, 5g, 100g, 2,5g, 250mg, 500mg.