Synonyms: Optical Brightening Agent ER-Ⅲ; 1,4'-bis(2-cyanostyryl) Benzole; optical brightener 199; C.I.199; Fluorescent Brightener 199; 1,4-BIS(4-CYANOSTYRYL)BENZENE; 4,4'-(p-phenylenediethene-2,1-diyl)bisbenzonitrile; Optical Brightening Agent ER C. I. 199; Benzonitrile, 4,4-(1,4-phenylenedi-2,1-ethenediyl)bis-; 1,4'-bis(2-cyanostyryl) Benzene; Optical Brightener ER; 1,4'-bis(2,4'-cyano-phenlene)-benzene; Optical Brightener ER II; Fluorescent Brightener ER-1; C.I. 199; 4,4'-(benzene-1,4-diyldiethene-2,1-diyl)dibenzonitrile; 4,4'-[benzene-1,4-diyldi(E)ethene-2,1-diyl]dibenzonitrile; 2-[2-[4-[2-(2-cyanophenyl)vinyl]phenyl]vinyl]benzonitrile; FBA 199; Fluorescent Brightener ER-I; ; Fluorescent Brightener ER; 1,4-Bis(2-cyanostyryl)benzene