Abstract
From Onychium japonicum ( Thunb.) Kunze, one new 1-indanone sesquiterpene, 4-hydroxypterosin N (OJ-14), two new cyathane type diterpenes onychiol E (OJ-16), onychiol F (OJ-17), and one new cyathane type glucoside, onychioside D (OJ-5) were isolated. The structures of these compounds were elucidated by spectral analysis and chemical methods. Seven known compounds, onychioside A (OJ-1), onychioside B (OJ-2), kaempferol -3,7-dirhamnoside (OJ-3), onychiol B (OJ-6), onychiol A (OJ-10), pteroside M (OJ-13), onitisin (OJ-7) were also identified.