摘要:

The structure (3S,5R,6R,7E,9R)-3,5,6-trihydroxy-β-ionyl-3-O-β-D-glucopyranoside has been attributed to stratioside II, a component of the methanolic extract ofPistia stratiotes, on the basis of its spectroscopic features and by chemical correlation.

ISSN:1057-5634    

DOI:10.1080/10575639608043244

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Biotransformation of (+)-yangabin inSpodoptera lituralarvae has been investigated. (+)-De-4′-O-methylyangabin-4′-O-β-D-glucoside were identified from the faeces of (+)-yangabin-administered larvae. The metabolic reaction of (+)-yangabin inSpodoptera lituralarvae is de-O-methylation atpara-position on the 3,4,5-trimethoxyl group followed by glucosidation.

ISSN:1057-5634    

DOI:10.1080/10575639608043245

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Two new C35acetogenins belonging to the A1type (one tetrahydrofuran ring and an unsaturated γ-lactone) annotemoyin-1 (1) and annotemoyin-2 (2) have been isolated from the cytotoxic methanolic extract ofAnnona atemoyaseeds and have been identified as structural isomers of solamin (5). Their structures were established on the basis of NMR spectroscopic techniques. In addition two previously reported acetogenins, uvariamicin-III (3) and reticulatain-1 (4) which are new to this species were obtained.

ISSN:1057-5634    

DOI:10.1080/10575639608043246

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

From the leaves, flowers and seeds ofA. dealbatafour lupene type triterpenes, lupenone, lupeol, lupenyl palpimate and lupenyl cinnamate, not previously reported in this genus, have been isolated. Their structures were established by spectroscopic means and by comparison with literature references.

ISSN:1057-5634    

DOI:10.1080/10575639608043247

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Three alkaloids, two of which could be fully characterised and were identified as elaeocarpidine1and epielaeocarpidine2, were isolated from leaves ofPelargoniumcultivar Appleblossom'. The structures were determined by means of UV, IR, Mass and NMR spectroscopy. This is the first report of alkaloids from the Geraniaceae.

ISSN:1057-5634    

DOI:10.1080/10575639608043248

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Incubation of Jurkat T cells in solutions containing the anti-tumor agent taxol® produced a taxol® derivative with longer retention time on reverse phase HPLC, which was identified using NMR and mass spectroscopy as 7-epi-taxol, a product which is also found when taxol® is treated with base. No epimerization occurs in absence of cells. Epimerization may be explained by abnormally high pH inside cancer cells, and taxol would be expected to lose activity quickly after treatment due to the lower anti-tumor activity of the isomer formed.

ISSN:1057-5634    

DOI:10.1080/10575639608043249

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Two new saponins named mussaendoside I (1) and J (2) were isolated from the aerial parts ofMussaenda pubescensAit.f. On the basis of chemical and spectral methods, including 2D NMR technique, their structures were elucidated as 3-O-β-D-glucopyranosyl(1→2)-O-β-D-glucopyranosyl pomolic acid 28-O-β-D-glucopyranosyl ester and 3β-O-α-L-rhamnopyranosyl(1→2)-O-β-D-glucopyranosyl oleanolic acid 28-O-β-D-glucopyranosyl ester, respectively.

ISSN:1057-5634    

DOI:10.1080/10575639608043250

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

From the aerial parts ofClematis chinensisa new pyranocoumarin named clematichinenol has been isolated and identified by spectroscopic methods. In addition, three known phenolics, (+)-syringaresinol, (-)-syringaresinol-4′-O-β-D-glucoside, acacetin-7-α-L-rhamnopyranosyl-(1-6)-β-D-glucopyranoside, and a lactone, digiprolactone were reported in the plant for the first time

ISSN:1057-5634    

DOI:10.1080/10575639608043251

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Three galloylquinic acids, 1,3,4,5-tetra-O-galloylquinic acid (1), 3,4,5-tri-O-galloylquinic acid (2), and methyl 3,4,5-tri-O-galloylquinate (3) were isolated from the stem bark of the monotypic plantLepidobotrys staudtii. Compound1protected target cells from the cytopathic effects of HIV-1 and HIV-2 and also exhibited potent inhibition of cellular DNA polymerases, as well as of the reverse transcriptases of HIV-1 and HIV-2, but not of other retroviruses tested.

ISSN:1057-5634    

DOI:10.1080/10575639608043252

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Streptomyces spec.HKI-0052 produces cytomycin (IIa) and the new 5′-hydroxymethylcytomycin (IIb) in addition to blasticidin S (Ia) and 5′-hydroxymethyl blasticidin S (Ib). The structure of the hithero unknown cytosine nucleoside IIb was settled by electrospray CID-MS/MS mass spectrometrical investigations.

ISSN:1057-5634    

DOI:10.1080/10575639608043253

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor