Two new tetracyclic diterpenoids trivially named as limbatenolide D (1) and limbatenolide E (2) have been isolated from Otostegia limbata. The structure elucidation of the compounds was based primarily on two-dimensional (2D) NMR techniques and on comparison with the literature data.
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Institute of Medicinal Plant Physiology and Ecology, School of Pharmaceutical Science, Guangzhou University of Chinese Medicine, Guangzhou, 510006, China. Electronic address:
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