Abiesanol A, a novel biflavanol with unique six connective hexacyclic rings isolated from Abies georgei
Xian‐Wen YangSumei LiLin FengYun‐Heng ShenJun‐Mian TianHua‐Wu ZengXiaohua LiuLei ShanJuan SuChuan ZhangWeidong Zhang
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A reinvestigation of the roots of Strychnos icaja resulted in the isolation of a new bisindole alkaloid named strychnobaillonine (1) with original C-17–N-1′ and C-23–C-17′ junctions, in addition to sungucine, bisnordihydrotoxiferine, and strychnohexamine (2). Compound 1 showed potent activity against the chloroquine-sensitive 3D7 strain of Plasmodium falciparum in vitro with an IC50 value of 1.1 μM. The structures of the compounds were defined by detailed spectroscopic analyses, especially 1H and 13C NMR, DEPT, HSQC, COSY, NOESY, HMBC, and HRESIMS. The proposed absolute configuration was based on biosynthetic considerations and spectroscopic data (CD, NMR) supported by molecular modeling.
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Мaқaлa дипломaтиялық іс-қaғaздaрының коммуникaтивті- прaгмaтикaлық ерекшелікте рін зерттеуге aрнaлғaн. Берілген мaқaлaдa aрaб тіліндегі дипломaтиялық іс қaғaздaрының сипaтты интегрaнттaрын aнықтaу мaқсaтындa aлғaш рет коммуникaтивті- прaгмaтикaлық aнaлиз жaсaлды. Зерттеу дипломaтиялық хaт aлмaс удың лексикaлық және синтaксистік проблемaлaрын aйқындaу негізінде жүргізілді. Зерттеудің қорытындысындa коммуникaтивті- прaгмaтикaлық ерекшеліктің шынaйылығы көрсетілді. Ауызшa нотa жaнрының aқпaрaттaндыру прaгмaтикaсы диплом aтиялық дискурстың қaтысушылaрының (aдресaнт пен aдресaт) кеңістік- уaқыттық өзaрa қaрым-қaтынaстaрын (хронотопты) және тaлқылaнaтын нысaнды aнықтaудaн өз көрінісін тaбaды. Дипломaтиялық дискурстың уaқыт индикaциясындa негізгі рөлді етістік aтқaрaтыны нaқты мысaлдaр aрқылы дәлелденді. Етістіктен бaсқa aуызшa нотaлaрдың мәтінінде уaқытты, күн, aй және жылды көрсету сияқты, нaқты индикaторлaрдың белсенді қолдaнылуы осы жaнрдың институционaлдығын aнықтaйды. Нaқты мерзімдерді (дaтaны – күн, aптa, aй, жылды) көрсету проспективaлық сипaтты, коммуникaнттaрдың өзaрa әрекеттестігін сипaттaйды. Мaқaлaдa прaгмa лингвистикaлық және дискурсивтік тaлдaу тұрғысынaн дипломaтиялық дискурстың лингвопрaгмaтикaлық сипaттaрынa кешенді зерттеу жүргізуге тaлпыныс жaсaлды. Мaқaлa жaзбaшa дипломaтиялық коммуникaциялaрдың дискурсивтік жaнрын лингвистикaлық тaлдaудың aйқын, әрі бaсым нысaны ретіндеболaшaқтa жүргізілетін зерттеулерге бaстaпқы қaдaм болып тaбылaды.
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New phyllocladane diterpene, phyllocladan-16α,17-dihydroxy-19-oic acid (1), together with known phyllocladane diterpene, phyllocladan-16α,19-diol (2), cembrane diterpene ovatodiolide (3), sitosteryl-3-O-β-D-glucoside (4), and verbascoside (5), were isolated from aerial parts of Anisomeles heyneana. The structure of compound 1 was elucidated by 1D and 2D NMR analyses which included HSQC, HMBC, and nuclear overhauser effect spectroscopy (NOESY) experiments as well as X-ray crystallography. This is the first report of phyllocladane diterpenes from genus Anisomeles. Compounds 1, 3, 4, and 5 were evaluated for inhibition of Mycobacterium tuberculosis and 3 was found to exhibit anti-mycobacterial activity with IC₉₀ 6.53 μg/ml. Compounds 1, 3, and 5, at 100 μg/ml, were also evaluated for inhibition of Thp-1 cell lines, and compounds 1 and 3 showed 59.02% and 96.4% inhibitions, respectively.
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A A A A AA A A A A A A A A AA A A A A A A A A A A A AA A A A A A A A A A A A A A A A A A A A AA A A A A A A A A A A A A A A A A A AA A A A A A A A A A A A A A A A A A A A A A A A A A A A AA A A A A A A A A A A A A A A A A A A A A A A A AA A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A AA A A A A A A A A A A A A A A A A A A A A A A A A A A A A A AA A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A
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Two new triterpenoid saponins, petersaponins III and IV (1 and 2), were isolated from an n-butanol extract of the bark of Petersianthus macrocarpus. They possess 21-O-benzoyl-22-O-acetylbarringtogenol C and 21-O-2-furoxyl-22-O-tigloylbarringtogenol C as the aglycon, respectively. For both 1 and 2, the trisaccharide moiety linked to C-3 of the aglycon consists of d-glucuronic acid, d-xylose, and d-galactose, while a l-rhamnose unit is linked to C-28. The structures of 1 and 2 were elucidated by extensive NMR experiments including 1H−1H (COSY, HOHAHA, NOESY) and 1H−13C (HMQC and HMBC) spectroscopy and by chemical evidence.
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A new briarane-type diterpenoid, named 2-acetoxyverecynarmin C, was isolated from the methanolic extract of an octocoral, Pennatula aculeata, that exhibited cyclooxygenase (COX) inhibitory activity. The structure of the compound was elucidated by ESI-HRMS, 1D and 2D NMR spectroscopy and comparison of the measured spectral data with those reported in the literature. The relative stereochemistry at chiral carbons was established from 2D NOESY experiments. 2-Acetoxyverecynarmin C is a tricyclic compound containing a furan ring at C-7,8 of a briarane skeleton. 2-Acetoxyverecynarmin C showed moderate inhibitory activity in in vitro COX-1 and COX-2 assays.
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Chemical investigation of the soft coral Cespitularia hypotentaculata resulted in the isolation of six new diterpenes, cespihypotins Q−V (1−6). The new metabolites comprised five verticillane-type diterpenes and one nor-verticillane derivative. Their structures were determined through detailed spectroscopic analyses, especially HRESIMS and 2D NMR techniques. The relative configuration was deduced by interpretation of NOESY spectra. Cespihypotin T (4) exhibited significant cytotoxic activity against human Daoy and WiDr tumor cell lines.
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Chemical investigation on CH2Cl2 extract of the marine sponge Diacarnus megaspinorhabdosa resulted in the isolation of two new farnesylacetone derivatives 1–2, a new γ-lactone 3, a known dinorditerpenone 4 and four known norsesterterpene peroxides 5–8. Their structures were elucidated by using one and two dimensional (1D and 2D)-NMR, high resolution-electrospray ionization (HR-ESI)-MS, and comparison with the literature. Compounds 1 and 2 were cis/trans-olefinic isomers and determined through nuclear Overhauser effect spectroscopy (NOESY) experiment. The absolute configuration of 3 was established by comparison of circular dichroism (CD) data with known lactones. The cytotoxic activities of the compounds were evaluated against five cancer cell lines, and compound 3 showed moderate cytotoxicity activities against cancer cell lines HeLa, H446, NCI-H460, SGC-7901 and MCF-7, with IC50 values in the range of 18.5 to 47.1 µM.
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