Diterpenes and kawalactone from the

Diterpenes and kawalactone from the rhizomes of Amomum uliginosum J.Koenig
Seven compounds, including three labdane diterpenes (1, 4, 6), one bisnorlabdane diterpene (2), one steroid (3), one sesquiterpene (5) and one kawalactone (7) were isolated from the rhizomes of Amomum uliginosum J.Koenig. Compounds 1–4, 6 and 7 were firstly isolated from the genus Amomum. This work represented the first phytochemical study on this plant. The chemotaxonomic significance of these compounds was summarized.
Amomun is the second largest genus in the Zingiberaceae. It is widely distributed from Indo-China to Sumatera where Borneo is the main centre of diversity. There are 16 species in Thailand ( Larsen and Larsen, 2006). Amomum uliginosum J.Koenig is a perennial plant found in Thailand and Malaysia. The rhizomes of A. uliginosum were collected from Chiang Rai province in May 2008. The sample was identified by Maxwell, J.F. of the CMU Herbarium, Department of Biology, Faculty of Science, Chiang Mai University, Thailand where a voucher specimen was deposited (08–131 J F. Maxwell).