Lambertianin CLambertianin C is an ellagitannin.Natural occurrenceLambertianin C can be found in Rubus species such as Rubus lambertianus, in cloudberries and in red raspberries.ChemistryLambertianin C is trimer of casuarictin linked by sanguisorbic acid ester groups between glucopyranose moieties. It contributes to the in vitro antioxidant activity of raspberries.