2.2'-Bis(2-chlorophenyl)-4.4'.5.5'-tetraphenyl-1.1'-biimidazole

2.2'-Bis(2-chlorophenyl)-4.4'.5.5'-tetraphenyl-1.1'-biimidazole 25g : This chlorophenyl biimidazole compound acts as a photostabilizer and UV absorber in coatings and plastics. Its biimidazole structure provides high UV resistance.