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A method for producing compounds of the formula: ##STR8## wherein A is selected from the group consisting of alkali metal cations and alkaline earth metal cations which comprises reacting 3,4-dihydroxycinnamic acid with acetic anhydride in pyridine for 18-30 hours, in organic solvents, giving 3,4-dihydroxycinnamic acid, diacetate, then converting to 3,4-dihydroxycinnamic acid chloride by treating with thionyl chloride in dimethylformamide at -20° to -18° C. for 30-90 minutes; reacting 4-O-α-D-glucopyranosyl-β-D-glucopyranosyl bromide, heptaacetate with sodium azide in dimethylsulfoxide at 55°-65° C. for 10-30 minutes, extracting in organic solvents, giving 4-O-α-D-glucopyranosyl-β-D-glucopyranosylazide, heptaacetate, then catalytically reducing, giving 4-Oα-D-glucopyranosyl-β-D-glucopyranosylamine, heptaacetate (heptaester); reacting a solution of the 3,4-dihydroxycinnamic acid chloride in dimethylformamide at -20° to -15° C. with a solution of the 4-O-α-D-glucopyranosyl-β-D-glucopyranosylamine, heptaacetate in pyridine at -15° to -5° C. for 20-40 minutes, then at -5° to 20° C. for 1-2 hours followed by extracting with organic solvents, giving N-(4-O-α-D-glucopyranosyl-β-D-glucopyranosyl)-3,4-dihydroxycinnamamide, nonaacetate (nonaester), then converting to N-(4-O-α-D-glucopyranosyl-β-D-glucopyranosyl)-3,4-dihydroxycinnamamide by reacting in a mixture of methanol, triethylamine and water, under an inert atmosphere for 20-30 hours followed by heating at reflux for 2-6 hours and extracting in organic solvents, reacting this derivative with triethylamine sulfur trioxide in N,N-dimethylacetamide under an inert atmosphere at 50°-70° C. for 15-20 hours, and then treating with an alkali metal or alkaline earth metal acetate in water.

1. customA method for producing compounds of the formula
2. customfor 18-30 hours