Product name:Optical Brightening Agent OB-1 C. I. 393 Appearance:Yellowish green granule Purity:99% min ... Vinyl Biphenyl)Dual BenzoxazoleCAS No.:1533-45-5Structural No.: C.I.393Molecular formula: C28H18N2O2Molecular weight: 414.4Appearance: Yellowish green ... ,and it is also widely used in plastics,such as PP,ABS,PS,HIPS,PA,PC,EVA,rigid PVC ... customers' request. Optical Brightening Agent OB-1 C. I. 393