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A new monomethylated ganglioside, DSG-A (3), was obtained, together with four known gangliosides, compounds (1, 2, 4, 5), from the lipid fraction of the chloroform/methanol extract of the ovary of the sea urchin Diadema setosum. The structures of the new ganglioside was determined on the basis of chemical and spectroscopic evidence to be 1-O-[9-O-methyl-(N-acetyl-alpha-D-neuraminosyl)-(2--&gt;6)-beta-D-glucopyranosyl]-ceramide (3). The ceramide moiety of 3 was composed of C18-phytosphingosine base, and 2-hydroxy and nonhydroxylated fatty acid units. These gangliosides showed neuritogenic activity toward the rat pheochromocytoma cell line PC-12 in the presence of nerve growth factor, in which compound 3 showed the most potent activity.

Isolation and Structure of a Monomethylated Ganglioside Possessing Neuritogenic Activity from the Ovary of the Sea Urchin Diadema setosum