What about using the families of alcohol that are synthesized from petroleum and are used in perfume,…

Answer

All kinds of alcohol (whether extracted from wood or other sources) are Tahir (ritually pure), and are not permissible to drink, except for wine which is also Najis, and Beer (Maa al-Sha'eir) which is also Najis (ritually impure) as an obligatory precaution.. So, the medicines and the perfumes containing alcohol are pure and can be used. It is also permissible to eat such food if the amount of alcohol is very minute, e.g., 2%, except for wine.