The amount of a cyanidin 35-diglucoside (66-malyl diester) when measured in blood serum. The trait is level of Cyanidin 3,5-diglucoside (6'',6'''-malyl diester) in blood serum (Ontology of Biological Attributes id OBA_2045203). Also known as: blood serum cyanidin 35-diglucoside (66-malyl diester) amount.