Marine natural occurring 2,5-diketopiperazines : isolation, synthesis and optical properties Laville, R. Thanh Binh Nguyen Moriou, C. /Petek, Sylvain /Debitus, Cécile Al-Mourabit, A. SUBSTANCE NATURELLE RECIF CORALLIEN INVERTEBRE AQUATIQUE EXTRACTION ANALYSE CHIMIQUE STRUCTURE CHIMIQUE SPECTROSCOPIE EPONGE MARINE Seven 2,5-diketopiperazines (DKPs) were isolated from the Fijian marine sponge Acanthella cavernosa. NMR and circular dichroism (CD) comparison with synthetic L-L DKPs allowed us to determine unambiguously the L-L absolute configuration of the natural DKPs. This work initiated the setting up of an optical properties database of natural DKPs, including specific rotation and CD. 2015 text https://www.documentation.ird.fr/hor/fdi:010063520 fdi:010063520 Laville R., Thanh Binh Nguyen, Moriou C., Petek Sylvain, Debitus Cécile, Al-Mourabit A.. Marine natural occurring 2,5-diketopiperazines : isolation, synthesis and optical properties. 2015, 90 (2), 1351-1366 EN FIDJI PACIFIQUE