Figure 1.

Structures of bryostatins “0”-20 (“bryostatin 0” is the hypothetical precursor to all the known bryostatins). Bryostatins which contain octa-2,4-dienoate moieties (in blue) are found only in the Deep B. neritina sibling species, whereas Shallow B. neritina contains bryostatins with other kinds of esterifications (in green). The oxygen groups highlighted in red represent the pharmacophoric elements involved in binding to PKC.