J Integr Plant Biol. ›› 2004, Vol. 46 ›› Issue (2): 159-164.

• Research Articles • Previous Articles     Next Articles

Two New Bis-labdanic Diterpenoids from Alpinia calcarata

KONG Ling-Yi, QIN Min-Jian , NIWA Masatake   


Two novel bis-labdanic diterpenoids named calcaratarin G and calcaratarin H were isolated from the rhizomes of Alpinia calcarata Rosc. Their structures were elucidated to be a pair of stereoisomers on the basis of the spectral evidence. The 2D NMR techniques including 1H-1H COSY, HMQC, HMBC, NOESY and HRFABMS were extensively applied to establish the structures.

Key words: Alpinia calcarata , bis-labdanic diterpenoids, calcaratarin G, calcaratarin H

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