2-[13-(dicyanomethylidene)pentacen-6-ylidene]propanedinitrile

4-(2-phenylethynyl)phenol

(1s,4s)-1-butyl-4-(phenylethynyl)cyclohexa-2,5-diene-1,4-diol

1-(2,4,5-trihydroxyphenyl)ethanone