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3
Two amides from piper Brachystachyum
Phytochemistry, Volume 28, Issue 11, 1989, Pages 3039-3042
Avijit Banerji, Chittaranjan Das
http://www.sciencedirect.com/science/article/pii/0031942289802754
4
Piperidine alkaloids from Piper retrofractum fruits
Phytochemistry, Volume 31, Issue 10, October 1992, Pages 3609-3612
Ahn Jong-Woong, Ahn Mi-Ja, Zee Ok-Pyo, Kim Eun-Joo, Lee Sueg-Geun, Jin Kim Hyung, Isao Kubo
http://www.sciencedirect.com/science/article/pii/003194229283736I
5
Structural and synthetic studies on the retrofractamides—amide constituents of Piper retrofractum
Phytochemistry, Volume 24, Issue 2, 5 February 1985, Pages 279-284
Avijit Banerji, Debabrata Bandyopadhyay, Manjusha Sarkar, Arup K. Siddhanta, Sudhir C. Pal, Somnath Ghosh, Koshy Abraham, James N. Shoolery
http://www.sciencedirect.com/science/article/pii/S0031942200835372