A benzofuranone type of compound known as 7-hydroxy-3-(1-hydroxyethyl)-5methoxy-3. 4-dimethylisobenzofuran-1 (3H)-one (1) and 4. 8-dihydroxy-6-methoxy-3. 4. https://lecoureures.shop/product-category/ski-de-fond-equipement-fixations-pieces-de-rechange/