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5-(4-Hydroxyphenethenyl)-4,7-dime-thoxycoumarin, a New Constituent of Monotes engleri
Seo, Eun-Kyoung,Chai, Hee-Byung,Chagwedera, Tangai E.,Farnsworth, Norman R.,Cordell, Geoffrey A.,Pezzuto, John M.,Kinghorn, A. Douglas 梨花女子大學校 藥學硏究所 2000 藥學硏究論文集 Vol.- No.9
A new coumarin, 5-(4-hydroxyphenethenyl)-4,7-dimethoxycoumarin (1) was isolated from the combined ethyl acetate extracts of the root bark, root wood and stem bark of Monotes engleri, and found to be cytotoxic against two cell lines in a human tumor panel. Its structure was determined on the basis of spectroscopic methods.
NMR Techniques for the Structure Elucidation and Conformational Analysis of Natural Products
Geoffrey A. Cordell 한국생약학회 1988 생약학회지 Vol.19 No.3
The combined use of the J-modulated selective INEPT and CSCM ID NMR techniques is described for the structure elucidation of several new classes of compound including prionitin, the loureirins and larreantin, and for the regiosub stitution of the furanonaphthoquinones. Spectroscopic studies on the conformation of the cytotoxic agent savinin are also described, together with the NMR assignments and preliminary biosynthetic experiments on the antitumor antibiotic staurosporine.
Novel Cytotoxic Labdane Diterpenoids from Neouvaria acuminatissima
Lee, Ik Soo,Ma, Xianjian,Chai, Hee Byung,Madulid, Domingo A,Lamont, R . Brian,O'Neill, Melanie J .,Besterman, Jeffrey M .,Farnsworth, Norman R .,Soejarto, D . Doel,Cordell, Geoffrey A .,Pezzute, John 전남대학교 약품개발연구소 1996 약품개발연구지 Vol.4 No.1
Acuminolide (1), a cytotoxic labdane diterpene with a new type of carbon skeleton, was isolated from the stem irk of Neouvaria acuminatissima, together with its congeners 17-O-acetylacuminolide (2), and an inactive derivative, spiroacuminolide (3), Their structures were determined on the basis of spectroscopic and chemical methods, as well as X-ray cystallography. Isolation, structure elucidation and bioassay results are described.
Thio and Nitrogen Analogues of Acronycine
Geewananda, Y.A.,Gunawardana, P.,Cordell, Geoffrey A. The Pharmaceutical Society of Korea 1995 Archives of Pharmacal Research Vol.18 No.3
The thio, thio acetyl, oxime, and several hydrazone and azine derivatives of the antitumor alkaloid acronycine (1) were prepared. NMR spectroscopy was used to study the configurations around the C=N double bond in these acronycine derivatives. In the hydrazones and azines of acronycine the N-N bond assumes a syn configuration to the $C_6-OCH_3$ group, while the NO bond in the oxime and the N-N bond in noracronycine hydrazone and azines assumes an anti configuration.
Lee Juian Lin,Duangdeun Meksuriyen,Geoffrey A. Cordell,Won Sick Woo,Chung Kyu Lee 한국생약학회 1987 생약학회지 Vol.18 No.2
The structure of the neolignan americanin A was confirmed to be 2, through the application of the Selective INEPT NMR technique. Complete and unambiguous proton and <sup>13</sup>C-NMR assignments are provided.
Bioactive Prenylated Flavonoids from the Stem Bark of Artocarpus kemando
Seo, Eun-Kyoung,Lee, Dong-Ho,Shin, Young-Geun,Chai, Hee-Byung,Navarro, Hernan-A.,Kardono, Leonardus B.S.,Wani, Mansukh, C.,Rahman, Ismail,Cordell, Geoffrey-A.,Farnsworth, Narman-R.,Pezzuto, John-M.,Ki The Pharmaceutical Society of Korea 2003 Archives of Pharmacal Research Vol.26 No.2
Four known prenylated flavonoids, artonins E (1) and O (2), artobiloxanthone (3), and cycloartobiloxanthone (4), were isolated from the stem bark of Artocarpus kemando by bioassayguided fractionation using the DNA strand-scission and the KB cytotoxicity assays as monitors. Compounds 1 and 3 exhibited strong DNA strand-scission activity, and all four compounds were found to be cytotoxic.