12. Takuya Matsumoto, Inder Pal Singh, Hideo Etoh, and Hitoshi Tanaka: The First Total Synthesis of Grandinal, A New Phloroglucinol Derivative Isolated from Eucalyptus gandis
Chemistry Letters, 210-211 (2001).
13. Hitoshi Tanaka, Hideo Etoh, Naoharu Watanabe, Hiroshi Shimizu, Mansoor Ahmad, and Ghazala Hafeez Rizwani: Erysubins C-F, Four Isoflavonoids from Erythrina suberosa var. glabrescences.
Phytochemistry, 56 (7), 767-773 (2001).
14. Ting-Guo Kang, Wen-Jun Zhang, Hitoshi Tanaka, Tomoko Kawamura, Zhao-Huixu Xu, Song-Song Yang, Zhong-Zhen Zhao, and Toshihiro Tanaka: Pharmacognostical Evaluation of Arctii Fructus (4) Chemical Constituents from Fruits of Arctium tomentosum
Natural Medicines, 55 (3), 153 (2001).
15. Hitoshi Tanaka, Mitsunobu Doi, Hideo Etoh, Naoharu Watanabe, Hiroshi Shimizu, Miyuki Hirata, Mansoor Ahmad, Imran Qurashi, and Mohammad Rehan Khan: Revised Structures for Senegalensin and Euchrenone b10
J. Nat. Prod., 64 (10), 1336-1340 (2001).
16. Hitoshi Tanaka, Miyuki Hirata, Hideo Etoh, Naoharu Watanabe, Hiroshi Shimizu, Mansoor Ahmad, Zahid Khan, and Munir Anwar: Three New Isoflavonoids from Erythrina variegata
Heterocycles, 55 (12), 2341-2347 (2001).
17. Hitoshi Tanaka, Hideo Etoh, Hiroshi Shimizu, Tomoko Oh-Uchi, Yukimasa Terada, and Yoichi Tateishi: Erythrinan Alkaloids and Isoflavonoids from Erythrina poeppigiana
Planta Med., 67, 871-873 (2001).
18. Tatsuya Niwa, Kazushi Murakami, Tetsuro Ohtake, Hideo Etoh, Atsushi Shimizu, Yasuo Shimizu, Yoji Kato, and Hitoshi Tanaka: Peroxynitrite Scavenging Activities of Aromatic Compounds Isolated from Konnyaku, Amorphophallus konjac K.Koch
Biosci. Biotechnol. Biochem., 66 (6) 1386-1388 (2002).
19. Hitoshi Tanaka, Tomoko Oh-Uchi, Hideo Etoh, Hiroshi Shimizu, and Yoichi Tateishi: Isoflavonoids from the Roots of Erythrina poeppigiana
Phytochemistry, 60 (8), 789-794 (2002).
20. Hitoshi Tanaka, Tomoko Oh-Uchi, Takao Nitanda, Masanori Baba, Hideo Etoh, and Hiroshi Shimizu：Prenylated Cinnamylphenols, HIV-1 Replication Inhibitors, from Erythrina poeppigiana.
ITE Letters, 3 (5), 612-615 (2002).
21. Hitoshi Tanaka, Miyuki Hirata, Hideo Etoh, Naoharu Watanabe, Hiroshi Shimizu, Mansoor Ahmad, Yukimasa Terada, and Toshio Fukai：Two Diphenylpropan-1,2-diol Syringates from the Roots of Erythrina variegata.
J. Nat. Prod., 65 (12), 1933-1935 (2002).