▁with ▁an il ine ▁derivatives ▁results ▁in ▁the ▁formation ▁of ▁a zo ▁d yes . ▁ ▁Com mer cially ▁important ▁d yes ▁derived ▁from ▁this ▁comp ound ▁include ▁Direct ▁Red ▁ 7 6 , ▁Direct ▁Brown ▁ 7 8 , ▁and ▁Direct ▁Orange ▁ 4 0 . ▁Red u ction ▁gives ▁ 4 , 4 ′ - d iam ino - 2 , 2 ′ - st il ben ed is ulf onic ▁acid , ▁which ▁is ▁a ▁common ▁optical ▁bright ener . ▁ ▁History ▁Arthur ▁Green ▁and ▁André ▁Wahl ▁first ▁reported ▁the ▁formation ▁of ▁dis od ium ▁ 4 , 4 '- d init rost il b ene - 2 , 2 '- dis ulf on ate ▁using ▁sod ium ▁hy po ch lor ite . ▁ ▁References ▁ ▁Category : Ben zen es ulf on ates ▁Category : A zo ▁comp ounds ▁Category : St il ben oid s ▁Category : Organ ic ▁sod ium ▁sal ts <0x0A> </s> ▁Le j la , ▁or ▁Le ila ▁as ▁it ▁is ▁listed ▁in ▁the ▁official ▁Euro vision ▁website , ▁was ▁the ▁Y ug oslav ian ▁entry ▁in ▁the ▁Euro vision ▁Song ▁Cont est ▁ 1 9 8 1 , ▁performed ▁in ▁Ser bo - C ro at ian ▁by ▁Se id ▁Mem ić ▁( V aj ta ) ▁. ▁ ▁The ▁song ▁was ▁performed ▁sevent h ▁on ▁the ▁night , ▁following ▁Den mark ' s ▁Tommy ▁Se eb ach ▁and ▁Deb bie ▁Camer on ▁with ▁" K r ø ll er ▁eller ▁ej