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A new disaccharide,digobiose 1, was isolated from the rhizomes of Macrothelypteris digophlebia (Bak.) Ching var. Elegans (koidz.). Its structure which is very similar with that of sucrose was identified as a -D-glucopyranosyl (1(r) 2￠ )-b -D-sorbopyranoside by spectroscopic analysis.