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Vergne, C.; Boury-Esnault, N.; PĂ©rez, T.; Martin, M.-T.; Adeline, M.-T.; Tran Huu Dau, E.; Al-Mourabit, A. (2006). Verpacamides A-D, a novel sequence of Diketopiperazines relating Cyclo(Pro-Pro) to Cyclo(Pro-Arg), from the marine sponge Axinella vaceleti: plausible biogenetic precursors of Pyrrole-2-Aminoimidazole Alkaloids. Organic Letters. 8: 2421-2424.