Chemical and Chemotaxonomical Studies on Filices. XLIII. Chemical Studies on the Constituents of Lindsaea javanensis BL., L. japonica (BAK.) DIELS and Tapeinidium pinnatum (CAV.) C. CHR.

Three new diterpene glycosides (V, VII and IX) were isolated from Lindsaea javanensis, together with lindsaea acid, 2β, 16α-dihydroxy-ent-kaurane 2-O-β-D-glucopyranoside and 16α, 17,19-trihydroxy-ent-kaurane 19-O-β-D-glucopyranoside. The structures of the new compounds were elucidated by spectroscopic methods as 16α, 19-dihydroxy-ent-kaurane 19-O-β-D-glucopyranoside, 12β, 16α, 17,19-tetrahydroxy-ent-kaurane 19-O-β-D-glucopyranoside and 12β, 16α, 19-trihydroxy-ent-kaurane 19-O-β-D-glucopyranoside, respectively. From L. japonica, ocoumaric acid was isolated, while lindsaea acid and 2,6-dimethoxybenzoquinone were isolated from Tapeinidium pinnatum.