for the following products
4'-(2'-N-Propyl-1,4'-dimethyl-(2,6'-dibenzimidazole)-1'-yl)methylene (1,1'-biphenyl)-2-methyl formate | 4'-[[1,4-Dimethyl-2'-propyl-[2,6-bi-1H-benzimidazol]-1'-yl]methyl]-1,1'-biphenyl-2-carboxylic acid dimethylethyl ester and 4'-[[1,4'-Dimethyl-2'-propyl(2,6'-bi-1H-benzimidazol)-1'-yl]-methyl]-1,1'-biphenyl-2-carboxylic acid 1,1-dimethylethyl ester
