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2, 2'- (1, 2-Ethenediyldi-4, 1-phenylene) Bisbenzoxazole/Ptical Brightening Agent Ob-1 CAS 1533-45-5, Find Details and Price about Ob-1 CAS 1533-45-5 Brightening Agent from 2, 2'- (1, 2-Ethenediyldi-4, 1-phenylene) Bisbenzoxazole/Ptical Brightening Agent Ob-1 CAS 1533-45-5 - Shandong Boyu Chemical Co., Ltd.