New Isoeudistomin Class Dihydro-β-Carbolines from an Undescribed Ascidian of the GenusEudistoma.

Abstract
19-Bromoisoeudistomin U (1) and isoeudistomin U (2), two new dihydro-β-carbolines have been isolated from an undescribed Western Australian ascidian of the genus Eudistoma. The structures of these dihydro-β-carbolines were determined by comprehensive spectral analyses primarily involving 2D NMR.