I would advice you to go to the database called KEGG and put this querry there. You will get the right answer from the site.

Hi

Panthenol (pantothenol) is the alcohol analog of pantothenic acid (vitamin B5), and is thus a provitamin of B5. In organisms it is quickly oxidized to pantothenate [pantothenic acid]. Panthenol is a highly viscous transparent liquid at room temperature, but salts of pantothenic acid (for example sodium pantothenate) are powders (typically white). It is soluble in water, alcohol, propylene glycol, ether and chloroform, and slightly soluble in glycerin.

Panthenol comes in two enantiomers, D and L. Only D-panthenol (dexpanthenol) is biologically active, however both forms have moisturizing properties. For cosmetic use, panthenol comes either in D form, or as a racemic mixture of D and L (DL-panthenol).

Panthenol's expanded chemical formula is: HO-CH2-C(CH3)2-CH(OH)-CONH-CH2CH2CH2-OH

D-panthenol , commonly known as provitamin B 5 < / sub > is a nutritional supplement of vitamin B spin class , widely used in the fields of pharmaceuticals, cosmetics, food , feed , this paper focuses on the preparation and critical factors optimization , the main content may be divided into three parts: the first is the preparation of D - pantolactone , the first formaldehyde , isobutyraldehyde and diethyl oxalate for the starting material synthesis keto pantolactone , then by catalytic hydrogenation to give DL- pantolactone , and then the D- pantolactone , obtained through the physical split to obtain the specific rotation of the product is consistent with imported products . By single factor optimization experiments to find the optimum reaction conditions , the the pantolactone keto group in a yield of 71.8% , the catalytic hydrogenation of keto pantolactone conversion was 99 % , DL - pantolactone with guanidine as demolition sub - agent , simple and practical . The second is the 3 - amino - propanol , obtained by catalytic hydrogenation of the eye condensates oxime propylene cracking : i.e. first to the ketone , hydroxylamine hydrochloride as a starting material was synthesized under alkaline conditions, oxime , and then reaction with acrylonitrile The ketoxime acrylonitrile condensates cracking obtained by catalytic hydrogenation of 3 - amino - propanol . Single factor and orthogonal experiment method to determine the optimum reaction conditions , 44% of the total yield of the three-step reaction , the product content of 98.5-99 % , to meet the needs of D-panthenol synthetic experiment . The third is the synthesis of D-panthenol , i.e. before the process was obtained D - pantolactone , 3 - aminopropanol as raw material , after the reaction was refluxed in methanol to give the target product -D- panthenol , product quality and meet the standard requirements , polarimetry is 30.30 °, the reaction yield is close to 100% . Of the process route to overcome the cyanidation route widely used in the domestic problems of environmental pollution and harm to human body , yet reported , is a new type of environmentally friendly route , in line with the direction of the development of the national industrial policy , but also in the second step 3 - in the synthesis of amino- propanol , replaced by the the patent introduction of methyl raw material a different ketone in the product , but also take into account the market potential of the byproducts , innovative technology can fill the the the process routes blank

Thanks a lot Talaat I. El-Emary. Appreciated your valuable feedback.