Lambertianin C is an ellagitannin. Lambertianin C is an ellagitannin. Lambertianin C can be found in Rubus species such as Rubus lambertianus, in cloudberries (Rubus chamaemorus) and in red raspberries (Rubus idaeus). Lambertianin C is trimer of casuarictin linked by sanguisorbic acid ester groups between glucopyranose moieties. It contributes to the antioxidant capacity of raspberries.