Fatwa: Alcohol in perfume

Salam alaikum, thank you for this fatwa !

I wonder also if it is allowed to ingest pharmaceutical pills that contain synthetic alcohols, such as cetyl alcohol for example ? Here is the process of fabrication :

Cetyl alcohol was discovered in 1817 by the French chemist Michel Chevreul when he heated spermaceti, a waxy substance obtained from sperm whale oil, with caustic potash (potassium hydroxide). Flakes of cetyl alcohol were left behind on cooling.[3] Modern production is based around the reduction of palmitic acid, which is obtained from palm oil.

This seems to be called "alcohol" without really being alcohol in the sense that usually includes ?

Also, what is the judgement about ingestion of " denatured alcohol " which is also commonly found in pharmaceutical pills ? Here is a definition of this type of alcohol :

Denatured alcohol, also called methylated spirits or denatured rectified spirit, is ethanol that has additives to make it poisonous, somewhat bad tasting, foul smelling or nauseating, to discourage recreational consumption. In some cases it is also dyed [...] Denaturing alcohol does not chemically alter the ethanol molecule. Rather, the ethanol is mixed with other chemicals to form an undrinkable solution. For many of these solutions, there is no practical way to separate the components. Labels such as "cannot be made nonpoisonous" communicate to users that they should not trust any alcohol claiming to be rendered safe by distilling, filtering, or additives.

Many thanks !

Thank you, Allah yjazik bi khayr !