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The alkaloid ageladine A, a pyrrole–imidazole alkaloid isolated from marine Agelas sponges shows fluorescence in the blue–green range during excitation with UV light with the highest absorption at 370nm. The fluorescence of this alkaloid is pH dependent. Highest fluorescence is observed at pH 4, lowest at pH 9 with the largest fluorescence changes between pH 6 and 7. Ageladine A is brominated, which...
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