5-Bromo-L-tryptophan is an α-amino acid derivative that can be found in Semenospongia sp.[1].
[1]. Deniz Tasdemir, et al. Cytotoxic bromoindole derivatives and terpenes from the Philippine marine sponge Smenospongia sp. Z Naturforsch C J Biosci. 2002 Sep-Oct;57(9-10):914-22.
















