Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Starting from L-xylose and D-xylose derivatives, (-)-sesbanimide A and (+)-sesbanimide A, respectively, have been synthesized. The carbohydrate templates constitute ring B of the alkaloid on which the remaining two rings are constructed in the sequence B → AB → ABC.