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piperonal, a compound with the odor of heliotrope flowers. Heliotropin forms colorless crystals. Its melting point is 36.5°-37° C, and its boiling point is 263° C. It is poorly soluble in water and more soluble in organic solvents; it is easily distilled with water vapor. Heliotropin is contained in heliotrope flowers, in vanilla pods, and in some essential oils. Industrially, heliotropin is obtained from safrole. Heliotropin is used in the perfume industry and cosmetics and in the production of toilet soaps.