Complete structure elucidation of shishididemniols, complex lipids with tyramine-derived tether and two serinol units, from a marine tunicate of the family didemnidae

The isolation, structure elucidation and antimicrobial activity of two new serinolipid derivatives, shishididemniols A and B is described, as antibacterial constituents of a tunicate of the family didemnidae. Shishididemniols, didemniserinolipids, and cyclodidemniserinol trisulfate, all possess [C.sub.28]-polyketide acid in the central part of the molecule.