The trikentrins: novel indoles from the sponge Trikentrion flabelliforme

Abstract Five new indoles, cis -trikentrin A (1), trans -trikentrin A (2), trans -trikentrin B (3), cis -trikentrin B (4) and iso - trans -trikentrin B (5), were isolated from the marine sponge Trikentrion flabelliforme . All possess antimicrobial activity and were identified by detailed spectroscopic analysis.