sentence: Many modern perfumes contain synthesized odorants.
sentences_after: Synthetics can provide fragrances which are not found in nature. For instance, Calone, a compound of synthetic origin, gives a fresh metallic marine scent that is widely used. Synthetic aromatics are often used as an alternate to compounds that are not easily got from natural sources.
concept_name: modern perfume
headings: Perfume Sources Synthetic sources