cyanidin 3-O-beta-D-glucoside + UDP-alpha-D-glucuronate = cyanidin 3-O-(2-O-beta-D-glucuronosyl)-beta-D-glucoside + UDP + H(+)
cyanidin 3-o-beta-d-glucoside + udp-alpha-d-glucuronate = cyanidin 3-o-(2-o-beta-d-glucuronosyl)-beta-d-glucoside + udp + h(+)