Fluorescent Brightener OB-1 Chemical name: 2,2-(l,2-EthenediyIdi-4,l-phenylene) bisbenzoxazoIe Molecular Formula: C28H18N2O2 Molecular Weight: 414.4 Executive Standard: Q/LQH010-2003 Max. spectrum absorption: 374nm Max. optic emitting spectrum: 434nm Parameters: Appearance: Yellowish green powder PURITY: >=99.9%, Smell: No special smell, Melting point: 353-359°C, Cauterant Residua: =