Benzoicacid, 4,5-dimethoxy-2-[(2-methoxy-1-oxo-2-propenyl)amino]-, 3'(12)-ester withmethyl [8-[[4,6-dideoxy-2-O-[2,4-dideoxy-3-O-methyl-4-(methylamino)-a-L-threo-pentopyranosyl]-4-[[(2,6-dideoxy-4-S-methyl-4-thio-b-D-ribo-hexopyranosyl)oxy]amino]-b-D-gluc