Fig. 7. 1H–1H in Iboga-type alkaloids with Indolizidino[8,7-b]Indole scaffold and bisindole alkaloids from Tabernaemontana bufalina Lour

Fig. 7. 1H–1H COSY (red bold) and selected HMBC (blue single arrows) correlations of 4 (up left) and 5 (up right), and key NOESY (blue dashed arrows) correlations of 4. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)