White willow bark P.E Botanical Name: Salix alba L. CAS Registry number: 138-52-3 Molecular Formula: C13H18O7 Molecular Weight: 286.28 Specification: Salicin 15%,25%, 80%,98% by HPLC. Brief Introduction: Salicin is a bitter, white, crystalline or powdery glucoside,which acts as a precursor compound for the synthesis of acetyl salicylic acid.We obtaine it from the bark of white willows. Salicin is helpful for mild feverish colds and infections (influenza), acute and chronic rheumatic disorders,mild headaches, and pain caused by inflammation. Salicin is used in medicine for the same purposes as salicylic acid and the salicylates. It is also used as a bitter tonic, i.e. a gastric stimulant, in doses of five grains.