Answer:
2
Step-by-step explanation:
Panthenol (or provitamin B5) is an active ingredient used as a moisturizer, in particular, to treat sensitive and dry skin. It also goes into the hair care formulation to nourish dry hair. All the benefits of this precursor of vitamin B5.
It has moisturizing, anti-inflammatory, regenerating, and healing properties. Panthenol also strengthens the hydrolipidic film, improves the elasticity of the skin, and promotes cell renewal in the event of injuries: this is why it is also used in the event of injuries or sunburn.
Thus, from the image below, the structure of Panthenol is being shown and the number of possible stereoisomers is being outlined as well.