Results 31 to 40 of about 4,243 (215)
Amber imitation? Two unusual cases of Pinus resin-coated beads in Iberian Late Prehistory (3rd and 2nd millennia BC) [PDF]
, 2019 A group of beads from the artificial cave of La Molina (Lora de Estepa, Sevilla) and Cova del Gegant (Sitges, Barcelona) were made from a biogenic raw material and intentionally covered by a layer of resin.
Avilés Escaño, Miguel Ángel +5 more
core +2 more sources
C20-nor-Abietane and Three Abietane Diterpenoids from Plectranthus mutabilis Leaves as P-Glycoprotein Modulators [PDF]
ACS Medicinal Chemistry Letters, 2022 In this study, a bioguided fractionation of Plectranthus mutabilis extract was performed by chromatographic methods. It yielded one new nor-abietane diterpene, mutabilol (1), and three known abietanes, coleon-U-quinone (2), 8α,9α-epoxycoleon-U-quinone (3), and coleon U (4).
Epole N. Ntungwe +8 more
openaire +6 more sources
Molecules, 2022 Ent-abietane diterpenoids are the main active constituents of Euphorbia fischeriana. In the continuing search for new anti-breast cancer drugs, 11 ent-abietane diterpenoids (1–11) were isolated from E. fischeriana.
Gang Chen +5 more
doaj +1 more source
New Abietane and Seco-abietane Diterpenes from the Roots of Taiwania cryptomerioides
Chemical and Pharmaceutical Bulletin, 2005 Four new diterpenes, 3-oxosaprorthoquinone (1), 3-oxomicrostegiol (2), 3-oxoisotaxodione (3), and taiwaninal (4), together with two known compounds, 3-oxosapriparaquinone (5) and 6-dehydrohinokiol (6), were isolated from the roots of Taiwania cryptomerioides. The structures of 1-4 were principle elucidated based on spectral evidence.
Chiou-Feng, Chyu +2 more
openaire +3 more sources
13C-NMR Data of Three Important Diterpenes Isolated from Euphorbia Species
Molecules, 2009 Euphorbia species are widely distributed plants, many of which are used in folk medicine. Over the past twenty years, they have received considerable phytochemical and biological attention.
Fen-Qiang You +5 more
doaj +1 more source
Anti-Zika virus activity of several abietane-type ferruginol analogues
Revista do Instituto de Medicina Tropical de São Paulo, 2020 Abietane diterpenoids are naturally occurring plant metabolites with a broad spectrum of biological effects including antibacterial, antileishmanial, antitumor, antioxidant, as well as antiinflammatory activities.
Francielle T. G. Sousa +4 more
doaj +1 more source
Cyclohepta[de]naphthalenes and the Rearranged Abietane Framework of Microstegiol via Nicholas Reaction Chemistry [PDF]
, 2009 Nicholas reactions on 2,7-dioxygenated naphthalenes give C-1 monosubstitution and C-1/C-8 disubstitution in most cases. From gamma-carbonyl cation monocondensation product 3b or alkyne-unsubstituted dicondensation product 4a, cyclohepta[de]naphthalenes ...
Abhayawardhana, Anusha +2 more
core +3 more sources
Communications Chemistry, 2023 The biomimetic two-phase strategy employing polyene cyclization and subsequent oxidation/substitution is an effective approach for divergent syntheses of [6-6-6]-tricyclic diterpenes.
Riichi Hashimoto +3 more
doaj +1 more source
DITERPENOS ENT-ABIETANOS DE Euphorbia phosphorea (EUPHORBIACEAE)
Química Nova, 2022 Phytochemical study of the roots of Euphorbia phosphorea Mart. (Euphorbiaceae) was carried out through chromatographic techniques, resulting in the isolation of a new ent-abietane diterpene named 11β,12β-dihydroxy-ent-abieta-8(14),13(15)-dien-16,12α ...
Roseana A. R. Meireles +11 more
doaj +1 more source
Characterization of organic compounds in weathered stones [PDF]
, 1991 3 pages, 3 figures, 1 table, 8 references. Trabajo presentado al citado Simposio, celebrado del 13-16, junio, 1989, en Bologna, Italia.Solvent extraction and pyrolysis of the black sulfated crusts obtained from the Custom House, a 18th century building ...
Sáiz-Jiménez, Cesáreo
core +1 more source