“…Our data for erysotrine (1), erysodine (2), erythraline (3), erytharbine (4), and erysotrine N-oxide (5), backed up by two-dimensional experiments, lead to assignments that are in complete agreement with those published in the reviews of Chawla et al 1 and Amer et al, 2 and in most of the later papers, which follow a common pattern. The only assignments we have identified diverging from this scheme are in the previously cited article on E. fusca alkaloids by Calle et al, 25 where the 13 C NMR assignments of C-1 (135.5 ppm) and C-2 (123.2 ppm) of 8-oxoerysodine, using only one-dimensional spectra, are inverted, and in a paper by Flausino et al, 27 using 1 H-1 H COSY, HMQC and HMBC, who arrived at a similar conclusion for 11a-hydroxyerythravine (in pyridine-d 5 ) and 11a-hydroxyerysotrine (in CDCl 3 ): d 135.0 and 131.5 (C-1), 124.5 and 125.5 (C-2), plus 124.4 and 123.5 (C-7), respectively.…”