Schirrmacher, Esther; Schirrmacher, Ralf; Thews, Oliver; Dillenburg, Wolfgang; Helisch, Andreas; Wessler, Ignatz; Buhl, Roland; Hoehnemann, Sabine; Buchholz, Hans-Georg; Bartenstein, Peter; Machulla, Hans-Juergen; Roesch, Frank Bioorganic and Medicinal Chemistry Letters, 2003 , vol. 13, # 16 p. 2687 - 2692