Fig. 3 in Alkaloid and iridoid glucosides from Palicourea luxurians (Rubiaceae: Palicoureeae) indicate tryptamine- and tryptophan-iridoid alkaloid formation apart the strictosidine pathway

Fig. 3. Most relevant correlations of isoalstrostine A (1) and dehydrorudgeifoline (2) indicated by correlation peaks in COSY (green), HMBC (red) and ROESY (blue), which are used for structure elucidation. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)