Nowill, Randall W.; Patel, Trisha J.; Beasley, David L.; Alvarez, Jose A.; Jackson III, Elizah; Hizer, Todd J.; Ghiviriga, Ion; Mateer, Scott C.; Feske, Brent D. Tetrahedron Letters, 2011 , vol. 52, # 19 p. 2440 - 2442