Iaroshenko, Viktor O.; Ali, Sajid; Mkrtchyan, Satenik; Gevorgyan, Ashot; Babar, Tariq Mahmood; Semeniuchenko, Volodymyr; Hassan, Zahid; Villinger, Alexander; Langer, Peter Tetrahedron Letters, 2012 , vol. 53, # 52 p. 7135 - 7139