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Marine natural products are promising sources of green antifoulants. Here, a new compound (1) was isolated from the soft coral Sinularia flexibilis. This compound, another nine cembranoids (2–10) from S. flexibilis, and three eunicellin-type diterpenoids (11–13) from the gorgonian Muricella sp. were tested for antifouling activity against larval settlement of the bryozoan Bugula neritina. Compounds 2, 3, 4, 9, 12, and 13 exhibited significant antifouling activity, with EC50 values of 18.2, 99.7, 67.9, 35.6, 33.9, and 49.3 μM, respectively. Analysis of the structure-activity relationships suggested that the hydroxy group at C-13 in compound 4 reduced its antifouling activity. [ABSTRACT FROM AUTHOR]

Two new iridoids, jatamanvaltrates N (1) and O (2), together with four known compounds (3–6), were isolated from the roots of Valeriana jatamansi. Their structures and relative configurations were elucidated by spectroscopic methods (IR, ESI-MS, HR-ESI-MS, 1D, and 2D NMR) and by comparison of their NMR spectral data with those of related compounds. All the isolated compounds were evaluated for their neuroprotective effects, and only compound 1 showed weak neuroprotective activities. [ABSTRACT FROM PUBLISHER]

Two new stilbenoids, 9-(4'-hydroxy-3'-methoxyphenyl)-10-(hydroxymethyl)-11-methoxy-5,6,9,10-tetrahydrophenanthro[2,3-b]furan-3-ol (1) and 2-(4''-hydroxybenzyl)-3-(3'-hydroxyphenethyl)-5-methoxy-cyclohexa-2,5-diene-1,4-dione (2), together with the three known stilbenoids were isolated from the tubers of Pleione bulbocodioides (Franch.) Rolfe. Their structures were elucidated by spectroscopic methods. [ABSTRACT FROM AUTHOR]

Two new triterpenoids, 25-anhydro-alisol F (1) and 11-anhydro-alisol F (2), were isolated from the rhizomes of Alisma orientalis. Their structures were elucidated by spectroscopic methods. [ABSTRACT FROM AUTHOR]

Two novel phenanthrofurans, shanciol G (1) and shanciol H (2), together with three known phenolic compounds were isolated from the tubers of Pleione bulbocodioides (Franch) Rolfe. Their structures were elucidated by spectroscopic methods. [ABSTRACT FROM AUTHOR]

Three new flavonol glycosides, kaempferol-3- O -(6- trans -caffeoyl)-β-d-glucopyranosyl-(1 → 2)-β-d-glucopyranoside (1), kaempferol-3- O -(6- trans -caffeoyl)-β-d-glucopyranosyl-(1 → 2)-β-d-glucopyranoside-7- O -β-d-glucopyranoside (2), and kaempferol-3- O -(6- trans -p-coumaroyl)-β-d-glucopyranosyl-(1 → 2)-β-d-glucopyranoside-7- O -β-d-glucopyranoside (3), were isolated from the aerial part of Camptosorus sibiricus . Their structures were elucidated by spectroscopic methods, including 2D NMR spectral techniques. [ABSTRACT FROM AUTHOR]

From the fruits of Celastrus orbiculatus Thunb. a new β-dihydroagarofuran sesquiterpene ester named 1β,2β,13-triacetoxy-9α-cinnamoyloxy-β-dihydroagarofuran ( 1 ) has been isolated along with two known compounds, 6α-acetoxy-1β,9β-dibenzoyloxy-8β-hydroxy-β-dihydroagarofuran ( 2 ), and 1β, 6α-diacetoxy-9β-benzoyloxy-8β-hydroxy-β-dihydroagarofuran ( 3 ). Their structures were elucidated on the basis of spectroscopic data. [ABSTRACT FROM AUTHOR]

From the fruits of Celastrus orbiculatus Thunb., a new dihydroagarofuran sesquiterpene ester named 6α,13β-diacetoxy-1β,8β,9β-tribenzoyloxy-β-dihydroagarofuran ( 1 ) has been isolated, along with three known compounds: 1β,6α,8β-triacetoxy-9α-benzoyloxy-β-agarofuran ( 2 ), 1β,6α-diacetoxy-9α-benzoyloxy-β-dihydroagarofuran ( 3 ) and β-sitostrol ( 4 ). The structure of 1 was elucidated on the basis of spectroscopic methods. [ABSTRACT FROM AUTHOR]

From the fruits of Celastrus orbiculatus Thunb. a new beta-dihydroagarofuran sesquiterpene ester named 1beta,2beta,13-triacetoxy-9alpha-cinnamoyloxy-beta-dihydroagarofuran (1) has been isolated along with two known compounds, 6alpha-acetoxy-1beta,9beta-dibenzoyloxy-8beta-hydroxy-beta-dihydroagarofuran (2), and 1beta, 6alpha-diacetoxy-9beta-benzoyloxy-8beta-hydroxy-beta-dihydroagarofuran (3). Their structures were elucidated on the basis of spectroscopic data.