Ecteinascidins 770 and 786 from the Thai Tunicate Ecteinascidia thurstoni

Ecteinascidins 770 (1b) and 786 (3b) were isolated from the pretreated Thai tunicate Ecteinascidia thurstoni with potassium cyanide in buffer solution (pH 7). These structures were fully elucidated by extensive 2D NMR analysis.