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The organic extract from Oceanapia bartschi has been shown to contain the antibiotic diterpene Ambliol A (1) and three indole derivatives, 3-bromoindole (2), 6-bromo-3-indolecarboxyaldehyde (3), and 6-bromo-5-hydroxy-3-indolecarboxyaldehyde (4). The structure of the novel compound 4 has been established from its spectroscopic ( 1 H and 13 C NMR, UV, IR, and MS) data
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Cafieri et al. (1993) studied this question.
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