cyanidin 3-O-glucoside 2-O''-xylosyltransferase activity
Catalysis of the reaction: cyanidin 3-O-beta-D-glucoside betaine + UDP-alpha-D-xylose = cyanidin 3-O-beta-D-sambubioside + UDP.
GO:0016763
pentosyltransferase activity
is_a