Abstract
Three new isopimarane-type diterpenoids, named callicapene M1 (1), callicapene M2 (2), and callicapene M3 (3), together with four known isopimarane-type diterpenoids (4, 5, 6, 7), were isolated from the Callicarpa macrophylla Vahl. Their structures were elucidated by spectroscopic techniques (IR, UV, MS, 1D, 2D NMR). The isolated compounds 6 and 7 exhibited potent inhibitory activity with inhibition rates of 40.23–46.78% on NO production in LPS-activated RAW 264.7 macrophage cells by using MTT assays.
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