Cyclohexanecarboxylic acid, 3-[[3-(3,4-dihydroxyphenyl)-1-oxo-2-propenyl]oxy]-1,4,5-trihydroxy-, monopotassium salt, [1S-(1alpha,3beta,4alpha,5alpha)]-, compd. with 3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione (1:1)