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Four new diterpenoids from Isodon eriocalyx var. laxiflora
- Wang, Wei-Guang, Du, Xue, Li, Xiao-Nian, Yan, Bing-Chao, Zhou, Min, Wu, Hai-Yan, Zhan, Rui, Dong, Ke, Pu, Jian-Xin, Sun, Han-Dong
- Nat. Prod. Bioprospect. 2013 v.3 no.4 pp. 145-149
- nuclear magnetic resonance spectroscopy, carbon, diterpenoids, Isodon (Lamiaceae)
- Four new diterpenoids, laxiflorins S-V (1–4), bearing four different types, and one known compound, laxiflorin O (5), were isolated from Isodon eriocalyx var. laxiflora. Compound 1 was the first example of ent-kauranoids bearing a unique C₂₄ carbon framework and compound 4 was the first example of 3,4-seco-ent-abietane diterpenoids from the Isodon genus. Their structures were determined by spectroscopic methods (UV, IR, MS, NMR).