Extensive fractionation of the crude organic extract from a Puerto Rican collection of Lyngbya majuscula led to the discovery of three new secondary metabolites: a quinoline alkaloid (1), malyngamide T (2), and a tryptophan derivative (3). In addition, several previously reported compounds, including the potent neurotoxins antillatoxin, antillatoxin B, and kalkitoxin, were identified. The structures of 1, 2, and 3 were deduced by NMR and mass spectral data interpretation and suggest the existence of a convergent biosynthetic pathway for these new and unusual metabolites.
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Nogle et al. (2003) studied this question.
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