Fig. 2. 1H 1H in Cytotoxic cardenolides from Calotropis gigantea

Fig. 2. 1H 1H COSY (blue bold), key HMBC (red arrows) and NOESY (black double arrow) correlations of compounds 1–5. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)