White Willow Bark Extract Salicin 15%-98%HPLC Latin Name: Salix Babylonica L. CAS No.: 138-52-3 Odor: Characteristic Molecular Formula: C13H18O7 Molecular Weight: 286.29 Fuctions: Has been used as analgesic, as antipyretic, as antirheumatic , as local anesthetics and as bitter stomachic tonic.