Eurocristatine, a new diketopiperazine dimer from the marine sponge-associated fungus Eurotium cristatum

► A new diketopiperazine dimer eurocristatine was isolated from the marine fungus Eurotium cristatum. ► The absolute configuration of the stereogenic carbons of eurocristatine was determined by X-ray crystallography. ► Erythroglaucin, physcion, catenarin, emodin, echinulin, neoechinulin A, neoechinulin E, variecolorin J were also isolated from this marine fungus.