bis-Benzoxazolyl derivative C.I. Fluorescent brightener 184 C.I. Fluorescent brightening agent 184 Fluorescent brightening agent 184 Fluorescent Brightener OB C.I. 184 2,2'-(2,5-Thienediyl)bis[5-(2-methyl-2-propanyl)-1,3-benzoxazole] Fluorescent Brightener 184 ISO 9001：2015 REACH