A new dimeric abietane-type diterpenoid, chamaeobtusaric (1), was isolated from the acetone extract of the trunk of Chamaecyparis obtusa var. formosana. The structure was established by spectroscopic analyses including 1D and 2D NMR (¹H, ¹³C, COSY, HSQC, HMBC, and NOESY) and HR-EI-MS and comparison ...

A novel chromone analogue, phyllomakin A (1), and a new flavonolignan, (-)-quiquelignan C (2), along with 18 phenolic and 2 triterpenoids, were isolated from the leaves of Phyllostachys makinoi Hayata. The structures of 1-22 were elucidated by an application of various spectroscopic analyses (1D...

One undescribed C₄₀ terpenoid, calomacroquinoic acid; four undescribed diterpenes, 5α,6α-epoxy-7α-hydroxyferruginol, 15-ethoxysugiol, 7-methoxy-6,7-secoabieta-8,11,13-triene-6,12-diol, and ethyl 7,8-secoabieta-11,14-dioxo-7-ate; two compounds isolated from Nature for the first time,...

A new seco-abietanoid, 12-methoxy-7-oxo-6,7-secoabieta-8,11,13-trien-6-oic acid (1), and a known seco-abietanoid,12-hydroxy-6,7-secoabieta-8,11,13-triene-6,7-dial (2), were isolated from the methanol extract of the bark of Cryptomeria japonica. Structure determination of the two compounds was...

A new seco-abietanoid, 12-hydroxy-6,7-seco-abieta-8,11,13-triene-6,7-dioic acid (1), was isolated from the methanol extract of the bark of Cryptomeria japonica. The structure was established by spectroscopic analyses including 1D and 2D NMR (¹H, ¹³C, COSY, HMQC, HMBC, and NOESY) and EI-MS and...

Taiwania (Taiwania cryptomerioides Hayata) has long been regarded as a living fossil from the Tertiary period of Mesozoic Era for its distinguished yellowish-red color with purplish-pink streaks presented in its heartwood. With this elegant appearance that matches the color "red" for good fortune...

Three new isopimaric acid diterpenoids, 6-oxoisopimaric acid (1), 6α-hydroxyisopimaric acid (2), and isopimara-7,9(11),15-trien-18-oic acid (4), together with two known isopimaric acid diterpenoids, isopimaric acid (3), and 8(14),15-isopimaradien-18-oic acid (5), were isolated from the bark of ...

Two new abietane-type diterpenoids, 15-hydroxy-12-O-methylsugiol (1) and 2α-hydroxy-12-O-methylsugiol (2) were isolated from the methanol extract of the bark of Cryptomeria japonica. Their structures were elucidated on the basis of spectroscopic analysis and comparison of NMR data with those of...

Two new dimeric abietane-type diterpenoids, 12-hydroxyabieta-8,11,13-trien-7α-yl 7β-hydroxyisopimara-8(14),15-diene-18-peroxoate (trivial name japonicinol A, 1) and 6α,7α-O-(7,8-secoabieta-9(11),13-diene-8,12-dioxo-7-ylidene)ferruginol (trivial name japonicinol B, 3), together with three known...

Pinus taiwanensis Hayata (Pinaceae) is an endemic plant in Taiwan. According to the Chinese Materia Medica Grand Dictionary, the Pinus species is mainly used to relieve pain, and eliminate pus and toxicity. In this study, nineteen compounds were isolated from the ethyl acetate layer of the...