Bioassay-guided fractionation of roots of Beilschmiedia tsangiiled to the isolation of six new endiandric acid analogues: tsangibeilin A (1), tsangibeilin B (2), endiandramide A (3), endiandric acid K (4), endiandric acid L (5), and endiandramide B (6). Also isolated were two new lignans, beilschminol A (7) and tsangin C (8), and six known compounds. The structures of 1–8were determined by spectroscopic techniques. Compounds 3and 6exhibited potent iNOS inhibitory activity, with IC50values of 9.59 and 16.40 μM, respectively.