[Isolation and identification of brominated alkaloids from the sponge Ircinia sp]

To study the alkaloids from sponge Ircinia sp..

The alkaloids were isolated and purified by various chromatographic techniques, and their structures were elucidated by physicochemical and spectral data.

Five alkaloids were isolated and identified as fistularin-1 (1), fistularin-3 (2), aerothionin (3), 11 -hydroxyaerothionin (4), suberamolline A (5).

All the alkaloids are isolated from Ircinia sp. for the first time.