... 2. R. Warmuth; ThesisJohann Wolfgang Goethe-Universität Frankfurt am Main (1992). 3. A. Prasanna de Silva, HQ Nimal Gunaratne, KRA Samankumura Sandanayake; Tetrahedron Lett., 31 (1990), pp. 5193–5196. ... In the ROESY spectrum of 11 the doublet at 6.47 ppm shows a significant contact with the multiplet at 3.27–3.34 ppm. 7. R. Warmuth, E. Grell, J.-M. Lehn, JW Bats, G. Quinkert; Helv. Chim. Acta, 74 (1991), pp. 671–681. ...