@Article{IPB-1894, author = {Schliemann, W. and Schneider, B. and Wray, V. and Schmidt, J. and Nimtz, M. and Porzel, A. and Böhm, H.}, title = {{Flavonols and an indole alkaloid skeleton bearing identical acylated glycosidic groups from yellow petals of Papaver nudicaule}}, year = {2006}, pages = {191-201}, journal = {Phytochemistry}, doi = {10.1016/j.phytochem.2005.11.002}, volume = {67}, abstract = {From yellow petals of Iceland poppy, besides the known flavonoid gossypitrin, seven kaempferol derivatives were isolated. In addition to kaempferol 3-O-β-sophoroside and kaempferol 3-O-β-sophoroside-7-O-β-glucoside, known from other plants, the mono- and dimalonyl conjugates of the latter were identified by MS and NMR spectroscopy. Structure analyses of a set of co-occurring pigments, the nudicaulins, revealed that they have the identical acylated glycoside moieties attached to a pentacyclic indole alkaloid skeleton for which the structure of 19-(4-hydroxyphenyl)-10H-1,10-ethenochromeno[2,3-b]indole-6,8,18-triol was deduced from MS and NMR as well as chemical and chiroptical methods.} }