obsolete cyanidin 3-O-glucoside 3'',6''-O-dimalonyltransferase activity (obsolete GO:0102589)
OBSOLETE. Catalysis of the reaction: cyanidin 3-O-(6-O-malonyl-beta-D-glucoside) + malonyl-CoA(5-) = cyanidin 3-O-(3''', 6''-O-dimalonyl-beta-glucopyranoside) + coenzyme A.