preferred_name: cyanidin 3-O-[6-O-(6-O-4-hydroxycinnamoyl-beta-D-glucosyl)-2-O-beta-D-xylosyl-beta-D-galactoside] + beta-D-glucose + H(+) => cyanidin 3-O-(6-O-glucosyl-2-O-xylosylgalactoside) betaine + 1-O-(trans-4-coumaroyl)-beta-D-glucose