N-(2,6-bis(5-hexylthiophen-2-yl)-4H-[2,1-b:3,4-b′]dithiophen-4-ylidene)-4-(octyloxy)aniline
4H-cyclopenta[2,1-b:3,4-b']dithiophen-4-one
2,2’-bis[4-(diphenylamino)phenyl]-6,6’-diformyl-4,4’-spirobi[cyclopenta[2,1-b;3,4-b’]dithiophene]
2,6-dibromo-4H-cyclopenta[2,1-b:3,4-b′]dithiophen-4-one