N-glycosides of amino acid amides from Hemerocallis fulva var. sempervirens.

As part of our search for sedative substances from natural sources, we isolated two novel amino acid amides connected with the fructopyranose, kwansonine A (1) and kwansonine B (2), together with three known amino acid amides, longitubanine A (3), longitubanine B (4), and pinnatanine (5), from Hemerocallis fulva L. var. sempervirens (ARAKI) M. HOTTA. The structures of 1 and 2 have been determined on the spectroscopic evidences as N(2)-(1-beta-D-fructopyranosyl)-N(5)-(2',5'-dihydro-2'-furyl-3'-hydroxymethyl)-gamma-hydroxyglutamine and N(2)-(1-beta-D-fructopyranosyl)-N(5)-(2-hydroxymethylbutadienyl)-gamma-hydroxyglutamine. This is the first report on the isolation of amino acid amide N-furctoside from Hemerocallis genus plant.