Synonyms: 4-Imidazolin-2-one,4,5-bis(p-sulfophenyl)-, disodium salt (5CI); Benzenesulfonic acid,4,4'-(2,3-dihydro-2-oxo-1H-imidazole-4,5-diyl)bis-, disodium salt (9CI);Benzenesulfonic acid, 4,4'-(2-oxo-4-imidazoline-4,5-diyl)di-, disodium salt(6CI,7CI,8CI); 4,5-Bis(p-sulfophenyl)-4-imidazolin-2-one disodium salt; BlancolTW; C.I. 40640; C.I. Fluorescent Brightener 48; C.I. Fluorescent BrighteningAgent 48, disodium salt; Fluorosol WS; Garbhelios; Ultraphor WT; Zarbhelios