obsolete delphinidin 3-O-glucoside 5-O-glucosyltransferase (vanilloyl-glucose dependent) activity (obsolete GO:0102513)
OBSOLETE. Catalysis of the reaction: delphinidin 3-O-beta-D-glucoside + 1-O-vanilloyl-beta-D-glucose = delphinidin 3,7-di O-beta-D-glucoside + vanillate + H+.