Raghunadh, Akula; Meruva, Suresh Babu; Mekala, Ramamohan; Raghavendra Rao; Krishna, Thalishetti; Gangadhara Chary; Vaikunta Rao; Syam Kumar Tetrahedron Letters, 2014 , vol. 55, # 18 p. 2986 - 2990