2,2'-Diformyl(3,3'-bithiophene)-4,4'-dicarboxylicacid

2,2'-Dihydroxy-4-methoxybenzophenone

2,2-Dimethoxy-1-(2-thienyl)ethanone

2,2-Dimethyl-3-(3-methyl-2,4-pentadienyl)-oxirane

2,2-Dimethylpropionic acid hydrazide

2-Propylpentanoyl chloride

2,2-DIPHENYLPROPIONIC ACID

2,2'-Dithiosalicylic acid

5,5'-Dihydroxy-2,2'-dinaphthylamine-7,7'-disulphonic acid