Fig. 2. Key 1H-1H in Dimeric and esterified sesquiterpenes from the liverwort Chiastocaulon caledonicum

Fig. 2. Key 1H-1H COSY (bold bonds) and HMBC (blue arrows) correlations of 1–4. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)