Several tetrapeptides (1–4) having two adenyl moieties at the side chains interacted complementary base-specifically with poly (dT) or poly (U). The hypochromic effects and CD spectra of the complexes suggested the formation of triplexes, which are more stable than those between natural ApA and the polynucleotides.
[Latli, Bachir; Jones, Paul-James; Krishnamurthy, Dhileepkumar; Senanayake, Chris H. Journal of Labelled Compounds and Radiopharmaceuticals, 2008 , vol. 51, # 1 p. 54 - 58]