Arsenicin A
 Arsenicin A, As 4O 3(CH 2) 3 is a complex molecule containing four arsenic atoms in a cage-like structure. It's found in tiny quantities in the New Caledonian marine sponge Echinochalina bargibanti and is the first poly-arsenic compound to have been isolated from nature. Its role in the marine sponge remains unknown, partly because of the lack of detailed knowledge about the chemical structure. Empirical formula: C 3H 6As 4O 3
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