2-[2-[(E)-2-phenylethenyl]-5-sulfonatophenyl]benzo[e]benzotriazole-7-sulfonate;disodium 2-[4-styryl-3-sulphonatophenyl]-2H-naphtho[1,2-d]triazole-7-sulphonate;2-[4-(2-Phenylethenyl)-3-(sodiosulfo)phenyl]-2H-naphtho[1,2-d]triazole-7-sulfonic acid sodium salt