Results 191 to 200 of about 4,729 (242)

Context-dependency of monarch butterfly (Danaus plexippus) egg abundance on milkweeds (Asclepias). [PDF]

PLoS One
Harris K, Reinbott TM, Woods T, Brabant JM, Harris G, Finke DL.   +5 more
europepmc   +1 more source

A 7,000-year-old multi-component arrow poison from Kruger Cave, South Africa. [PDF]

iScience
Bradfield J, Dubery IA, Steenkamp PA.
europepmc   +1 more source

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Aldimines of Cardenolides and Cardenolide-Glycosides

Chemistry of Natural Compounds, 2005
New aldimines were synthesized from the cardenolide strophantidin and cardenolide-glycosides erysimin and cymarin and included morpholine, nitrile, pyridine, furan, hydroxy- and methoxyphenyl, piperidine, and other derivatives. An effective modified method for synthesizing aldimines was proposed. 52 new compounds were synthesized. Their structures were
I. F. Makarevich, Yu. I. Gubin, R. Megges   +2 more
openaire   +1 more source

Cytotoxicity of cardenolides and cardenolide glycosides from Asclepias curassavica

Bioorganic & Medicinal Chemistry Letters, 2009
A new cardenolide, 12beta,14beta-dihydroxy-3beta,19-epoxy-3alpha-methoxy-5alpha-card-20(22)-enolide (6), and a new doubly linked cardenolide glycoside, 12beta-hydroxycalotropin (13), together with eleven known compounds, coroglaucigenin (1), 12beta-hydroxycoroglaucigenin (2), calotropagenin (3), desglucouzarin (4), 6'-O-feruloyl-desglucouzarin (5 ...
Jun-Zhu, Li, Chen, Qing, Chang-Xiang, Chen, Xiao-Jiang, Hao, Hai-Yang, Liu   +4 more
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Cardenolides from Erysimum cheiranthoides

Phytochemistry, 1996
Three new cardiac glycosides were isolated along with two known cardenolides from the seeds of Erysimum cheiranthoides. The new ones were characterized by spectral methods as 16 beta-hydroxystrophanthidin (strophadogenin) 3-O-beta-glucopyranosyl-(1-->4)-beta-boiviopyranoside, strophadogenin 3-O-alpha-rhamnopyranosyl-(1-->4)-beta-digitoxopyranoside and ...
Z H, Lei, S, Yahara, T, Nohara, T B, Shan, J Z, Xiong   +4 more
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Cardenolides from Adonis aestivalis

Phytochemistry, 1992
Four cardenolides were isolated for the first time from the aerial parts of Adonis aestivalis. The compounds were identified by spectrometry and for 3-epi-periplogenin, helveticoside also by comparison with authentic substances. Two new cardenolides were structurally elucidated: strophanthidin-3-O-beta-D-digitoxosido-alpha-L-cymarosido-be ta-D ...
B, Kopp, L, Krenn, E, Kubelka, W, Kubelka   +3 more
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Cardenolides from Nierembergia aristata

Journal of Natural Products, 1995
The EtOAc extract of the whole plant of the Argentinian species Nierembergia aristata showed significant cytotoxicity against eleven different cancer cell lines. In addition to several known compounds, bioassay-guided fractionation led to the isolation of three new cardenolides, 17-epi-11 alpha-hydroxy-6, 7-dehydrostrophanthidin-3-O-beta ...
R R, Gil, L Z, Lin, H B, Chai, J M, Pezzuto, G A, Cordell   +4 more
openaire   +2 more sources