CAS 399-53-1 appears in our catalog under these names: 2,4-Difluoro-1-vinylbenzene, 2,4-Difluorostyrene, 98%, 2,4-Difluoro-1-vinylbenzene 95% mix TBC as stabilizer. Offered by: Fluorochem, Combi-blocks, Ambeed. Available pack sizes: 250mg, 1g, 5g, 25g, 10g.