Draw the structure of gentiobiose?

The carbohydrate gentiobiose, C12H22O11, gives a positive test with Benedict's reagent and forms an osazone. Hydrolysis by aqueous acid or emulsin (beta-linkages) produces on D-glucose. Methylation of gentiobiose produces an octamethyl derivative which upon acid hydrolysis leads to 2,3,4,6-tetra-D-glucose and 2,3,4-trimethyl-D-glucose. Write a brief statement describing the structure of gentiobiose then draw the structure of gentiobiose.