Esteve, Cristina; Nueda, Arsenio; Diaz, Jose Luis; Beleta, Jorge; Cardenas, Alvaro; Lozoya, Estrella; Cadavid, Maria Isabel; Loza, Maria Isabel; Ryder, Hamish; Vidal, Bernat Bioorganic and Medicinal Chemistry Letters, 2006 , vol. 16, # 14 p. 3642 - 3645