Beschrieben wird eine Verbindung der Formel (I)und ihre Verwendung als Riechstoff, insbesondere als Maiglöckchen-Riechstoff und/oder als Mittel zum Erhöhen der Substantivität und/oder der Retention einer Riechstoffzubereitung und/oder als Fixateur.3-((R)-4-Isopropyl-cyclohex-1-enyl-propionaldehyde (I) and 3-((S)-4-isopropyl-cyclohex-1-enyl-propionaldehyde (II), are claimed. Independent claims are also included for: (1) a mixture comprising (I) and (II) (2) use of 3-(4-isopropyl-cyclohex-1-enyl)-propionaldehyde (III) as a perfume, preferably as lily of the valley perfume, as an agent for increasing the substantivity and/or the retention of a fragrance formulation, and/or as a fixative (3) a fragrance formulation, preferably perfume oil, comprising lily of the valley odor note, which comprises (III) and at least 2, 3, 4, 5, 6, 7, 8, 9 or 10 additional perfumes, which are not (III) (4) a perfumed product comprising (I) in a sensorial amount (5) providing skin, hair, surfaces, or textile fibers with an odor note, comprising providing the fragrance preparation comprising (III) and at least one additional perfume, where the amount of (III) is sufficient to impart, to modify and/or to intensify an odor note of lily of the valley in the fragrance preparation, and applying the fragrance preparation on skin, hair and/or textile fibers (6) producing (III), comprising an acid-catalyzed reaction of acetal compounds of formula (IV), or pyrolysis of 8-isopropyl-1-oxa-spiro[4.5]decan-2-one to form (III) (7) (IV) (8) use of d-(+) limonene as educt for producing (I), use of l-(-) limonene as educt for producing (II), or use of a mixture containing d-(+) limonene and l-(-) limonene as educt for producing a mixture containing (I) and (II) and (9) mediating, intensifying and/or modifying the odor note, and optionally odor note including floral, sweet, watery, powdery and ozone-like odor note of lily of the valley to a substance, comprising mixing or contacting the (III), the mixture, or
