Benzosceptrins A and B with a unique benzocyclobutane skeleton and nagelamide S and T from Pacific sponges Appenzeller, J. Tilvi, S. Martin, M. T. Gallard, J. F. El-bitar, H. Dau, E. T. H. /Debitus, Cécile /Laurent, Dominique Moriou, C. Al-Mourabit, A. Four new dimeric pyrrole-2-aminoimidazole alkaloids have been isolated from the Pacific marine sponges Agelas cf. mauritiana and Phakellia sp. They include the unusual C2 symmetrical benzosceptrins A (4) and B (5), which each possess a unique benzocyclobutane skeleton and nagelamides S (6) and T (7). Their structures and relative configuration were elucidated from spectroscopic data. Plausible biogenetic paths for these compounds are also proposed in this paper. 2009 text https://www.documentation.ird.fr/hor/fdi:010090950 fdi:010090950 Appenzeller J., Tilvi S., Martin M. T., Gallard J. F., El-bitar H., Dau E. T. H., Debitus Cécile, Laurent Dominique, Moriou C., Al-Mourabit A.. Benzosceptrins A and B with a unique benzocyclobutane skeleton and nagelamide S and T from Pacific sponges. 2009, 11 (21), 4874-4877 EN