Ryoda, Akemi; Yajima, Nana; Haga, Toyokazu; Kumamoto, Takuya; Nakanishi, Waka; Kawahata, Masatoshi; Yamaguchi, Kentaro; Ishikawa, Tsutomu Journal of Organic Chemistry, 2008 , vol. 73, # 1 p. 133 - 141