Studies on the Chemical Constitution of Agar-agar. XVIII. Isolation of a New Crystalline Disaccharide by Enzymatic Hydrolysis of Agar-agar

1. A new crystalline disaccharide has been isolated from enzymatic hydrolysates of agar. Its hexaacetate and phenylosazone have been prepared in crystalline states. 2. The name neoagarobiose has been assigned to the disaccharide isolated. 3. The structure of neoagarobiose has been shown beyond doubt to be 3-O-3′, 6′-anhydro-L-galactopyranosyl-D-galactose. It has been suggested that the glycoside linkage is of α′-configuration.