Chem. Pharm. Bull., 53(7),836-838, July 2005

Notes

A New Phytoecdysteroid from Ajuga taiwanensis

Yu-Yi CHAN,^*,a Tian-Shung WU,^b,c Chang Sheng KUOH,^d and Amooru G. DAMU^b

^a Department of Biotechnology, Southern Taiwan University of Technology; Tainan, Taiwan 710, R.O.C.: ^b Department of Chemistry, National Cheng Kung University; Tainan, Taiwan 701, R.O.C.: ^c National Research Institute of Chinese Medicine, Taipei; Taiwan 112, R.O.C.: and ^d Department of Life Sciences, National Cheng Kung University; Tainan, Taiwan 701, R.O.C. * To whom correspondence should be addressed. e-mail: yuyichan@mail.stut.edu.tw

A new phytoecdysteroid, namely ajugalide-E (1), together with twenty five known compounds were isolated from Ajuga taiwanensis collected from Tainan, Taiwan. Their structures were determined by spectral analysis including high resolution one- and two-dimensional NMR spectroscopy.

Key words Ajuga taiwanensis; Labiatae; phytoecdysteroid; ajugalide-E