Figure 3 | Scientific Reports

Figure 3

From: Structure of two purple pigments, catechinopyranocyanidins A and B from the seed-coat of the small red bean, Vigna angularis

Figure 3

Structures of catechinopyranocyanidins and their reaction products. (a) Structure of catechinopyranocyanidin A (2) and its colorless photo-degradation product (4). (b) Structure of catechinopyranocyanidin B (3) and its colorless photo-degradation product (5). (c) INADEQUATE and HMBC correlations obtained by 2D-NMR experiments of 4. (d) Hexamethylation of 4 to give 6 and resultant NOEs.

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