Figure 3.
Top: Key COSY (bolded lines), HMBC (solid, single-head arrows), and HSQC-TOCSY (dashed, single-head arrows) correlations supporting the structure of bromophycoic acid E (5). Bottom: NOEs observed for bromophycoic acid E (5) represented by double-headed arrows. NOE between Me25 (δ 1.15) and Me26 (δ 1.01) could not be confirmed due to near-overlapping chemical shifts.