CAS 1256573-07-5 appears in our catalog under these names: (5-(9H-Carbazol-9-yl)-1,3-phenylene)bis(diphenylphosphine oxide), 99%, Poly((9,9-dioctylfluorenyl-2,7-diyl)-alt-(6,6'-{2,2':6',2''-terpyridine})). Offered by: Chemat Brand, Lumtec. Available pack sizes: on request.