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Blood–brain barrier (BBB)-permeable components in the methanolic extract of Nelumbo nucifera flowers showed accelerative effects… Expand SummaryFrom the leaves ofLiriodendron tulipifera have been isolated d-caaverine and a new aporphine alkaloid—lirinidine—with the… Expand The dry comminuted raw material was extracted with methanol. The evaporated methanolic extract was treated with chloroform. The… Expand SummaryAs the result of a study of the leaves ofLiriodendron tulipifera L. according to the vegetation periods, it has been… Expand Bioactivity-directed fractionation led to the isolation of two new 7-dehydroaporphine alkaloids, 7-hydroxy-dehydrothalicsimidine… Expand Species from the section Miltantha are reviewed in the context of their contained alkaloids. Thebaine was isolated as the major… Expand