3-(4-methoxyphenylethynyl)-1-(phenylethynyl)imidazo[1,5-a]-pyridine

2-(4-methoxy-phenylethynyl)-benzothiazole

1,4-bis(4-tert-butylphenyl)buta-1,3-diyne

3-(4-Methoxyphenyl)-2,5-furandione