Cyanidin-3-O-glucoside 2-O-glucuronosyltransferase is an enzyme with systematic name UDP-D-glucuronate:cyanidin-3-O-beta-D-glucoside 2-O-beta-D-glucuronosyltransferase. This enzyme catalyses the following chemical reactionUDP-D-glucuronate + cyanidin 3-O-beta-D-glucoside UDP + cyanidin 3-O-(2-O-beta-D-glucuronosyl)-beta-D-glucoside