Propanedinitrile, 2,2'-[[4,4,9,9-tetrakis(4-hexylphenyl)-4,9-dihydrothie no[3',2':4,5]cyclopenta[1,2-b]thieno[2'',3'':3',4']cyclopenta[1',2':4,5] thieno[2,3-d]thiophene-2,7-diyl]bis[methylidyne(3-oxo-1H-indene-2, 1(3H)-diylidene)]]bis-