Five New Sulfur-containing Polybrominated Bisindoles from the Red Alga Laurencia brongniartii

Five new sulfur-containing polybrominated bisindole (1∼5) were isolated from the red alga, Laurencia brongniartii, in addition to six related compounds (6∼11), which have been previously found in the Okinawan alga. The structures of these new bisindole metabolites were elucidated on the basis of spectroscopic studies, as well as X-Ray crystallographic analysis of 1.