Klinchan, Chayada; Hsu, Yu-Ling; Lo, Lee-Chiang; Pluempanupat, Wanchai; Chuawong, Pitak Tetrahedron Letters, 2014, vol. 55, # 45 p. 6204 - 6207 doi: 10.1016/j.tetlet.2014.09.060