Galeuterone and pregaleuterone, labdane diterpenoids from Galeopsis reuteri
✍ Scribed by Giuseppe Savona; Maurizio Bruno; Orietta Servettaz; Benjamín Rodríguez
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 224 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0031-9422
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## Abstract A new labdane diterpene, amentotaxin A (**1**), and an unprecedented dinorlabdane diterpene, amentotaxin B (**2**), were isolated from the stems of __Amentotaxus argotaenia__ (Hance) Pilger, together with seven known compounds. Their structures were identified by in‐depth spectroscopic
Four C(8),C(12)-diastereoisomers, (8S,12S)-isoandrographolide (1), (8S,12R)-isoandrographolide (2), (8R,12R)-isoandrographolide (3), and (8R,12S)-isoandrographolide (4) were isolated from the aerial parts of Andrographis paniculata. The structures of the new compounds 1 -3 were established on the ba