New diterpene alkaloids from the roots of Spiraea japonica.

  title={New diterpene alkaloids from the roots of Spiraea japonica.},
  author={H P He and Y M Shen and Ji Xia Zhang and Guo Ying Zuo and X J Hao},
  journal={Journal of natural products},
  volume={64 3},
Chemical investigation on an ethanol extract from the roots of Spiraea japonica var. acuta resulted in the isolation of three new diterpene alkaloids named spiramide (1) and spiratine A (2) and spiratine B (3). Structures of 1-3 were elucidated primarily on the basis of 1D and 2D NMR experiments. 
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