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Three 3‐alkylpyridinium salts, pachychalines A (1), B (2) and C (3), were isolated from the Caribbean marine spongePachychalina sp. (order Haplosclerida). They are the first examples of 3‐(aminoalkyl)pyridinium salts. Their chemical structures were elucidated by NMR spectroscopy and detailed ESI HRMS–MS analysis. The total synthesis of 1 allowed the confirmation of the unusual C–C connection between both pyridinium moieties. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
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Laville et al. (2007) studied this question.
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