obsolete cyanidin 3-O-glucoside 7-O-glucosyltransferase (feruloyl-glucose dependent) activity (obsolete GO:0102514)
OBSOLETE. Catalysis of the reaction: cyanidin 3-O-beta-D-glucoside betaine + 1-O-feruloyl-beta-D-glucose = cyanidin 3,7-di-O-beta-D-glucoside betaine + ferulate + H+.