Perfume compound is a term used to describe the combination of ingredients used to create a scent. Two common compounds used in perfumes are esters and acetals. An ESTER is an organic compound formed by the reaction between an acid and an alcohol, and it is often used to give a fruity or floral scent. An acetal is an organic compound formed by the reaction between two alcohols, and it is often used to give a sweet or woody scent.