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Chemical & Pharmaceutical Bulletin|July 5, 2003
Two new cyclopentenone derivatives and a new cyclooctadienone derivative from Erigeron annuus (L.) PERS., Erigeron philadelphicus L., and Erigeron sumatrensis RETZTakeyoshi Iijima, Yasunori Yaoita, Masao KikuchiChemical & Pharmaceutical Bulletin|May 9, 2003
Five new sesquiterpenoids and a new diterpenoid from Erigeron annuus (L.) PERS., Erigeron philadelphicus L. and Erigeron sumatrensis RETZTakeyoshi Iijima, Yasunori Yaoita, Masao KikuchiChemical & Pharmaceutical Bulletin|August 23, 2002
Studies on the constituents of Lonicera species. XVII. New iridoid glycosides of the stems and leaves of Lonicera japonica THUNBKoichi Machida, Hiromi Sasaki, Takeyoshi Iijima, et al.Phytochemistry|April 9, 2002
Triterpenoids from Gentiana scabraRie Kakuda, Takeyoshi Iijima, Yasunori Yaoita, et al.Pageof 1