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.

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Abstract
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.

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