Abstract
A phytochemical investigation of the tuber of Bletilla striata afforded eight stilbene derivatives, including a new bibenzyl (1) and two new phenanthrene (2 and 3). The structures of these compounds were elucidated using a combination of spectroscopic analyses. Further, the anti-inflammatory activity of all the compounds was evaluated to assess their capability to inhibit nitric oxide (NO) production by RAW 264.7 macrophages. The bioactive screening revealed that compounds 4 and 7 exhibited moderate inhibitory effects against NO production with the IC50 values 38.7 and 16.7 μM, respectively.
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