Musk xylol, also known as musk ketone, is a synthetic compound commonly used in perfumery. It has a musky scent reminiscent of natural musk derived from musk deer, hence the name. Musk xylol is used as a fixative in perfumes, meaning it helps to stabilize and prolong the fragrance of the perfume on the skin. It's been widely used in the fragrance industry for decades, although its use has declined somewhat in recent years due to environmental and ethical concerns associated with animal-derived musk.