Synthetic studies on the l-hydroxy nortropane system: ... P.-H. Ducrot, J. Beauhaire and JY Lallemand. Labor&o& de synthdse orqanique, ossocit au CN RS, Ecole Polytechnique, 91168 Palaiseau France ... ABSTRACT :A general synthetic strategy for I-hydrozy nortropane ... Calystegines Br 1, B2 2 and As $, isolated from Calystegia sepium roots, are able to provide an exclusive carbon and nitrogen source to some rhizosphere bacteria able to catabolize them' and under ...