The 13C-nmr spectrum of repanduline was assigned from the known structure 2 by means of 13C-1H (HETCOR) 2D correlation experiments. Using data from repanduline in conjunction with 1H-1H (COSY) and HETCOR 2D studies on pseudorepanduline [1], the absolute stereochemistry of 1 has been determined. Some observations are made on the conformation of repanduline-type alkaloids and on their possible mode of biosynthesis.554455460