Why are Cistus plants used in soaps and scented products?

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Cistus plants, commonly known as rock rose, are used in soaps and scented products because they yield a pleasantly fragrant, bitter oleoresin known as labdanum (or ladanum).123

This resin is produced by various species within the genus, most notably Cistus ladanifer. Because of its aromatic properties, labdanum has long been valued as an ingredient in perfumery and as a scented additive in various consumer goods, including soaps.413