for the following products
2,2'-(1,2-Ethenediyldi-4,1-phenylene)bis[5-methyl-benzoxazole | 4,4'-bis-(5-Methylbenzoxazol-2-yl)stilbene | Fluorescent brightener agent ob-2 | Optical brightener OB-2 and 1,2-Bis(4-(5-methylbenzo[d]oxazol-2-yl)phenyl)ethene
