Thakur, Swapnadip; Ghosh, Parthasarathi; Akihisa, Toshihiro; Shimizu, Naoto; Tamura, Toshitake; Matsumoto, Taro Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1988 , vol. 27, # 1-12 p. 17 - 20