Beschrieben wird die Verwendung bestimmter Verbindungen aus der Gruppe der Oxyacetaldehyde als Riechstoffe mit einer Maiglöckchen-Note, und/oder als Mittel zum Erhöben der Substantivität und/oder der Retention einer Riechstoffzubereitung und/oder als Fixateur.Use of aldehyde compounds (I) or their mixtures containing at least one compound (I) or at least two compounds (I), as a perfume with a lily of the valley-note, as an agent for increasing substantivity and/or retention of a perfume composition and/or as a fixative, is claimed. Use of aldehyde compounds of formula (I) or their mixtures containing at least one compound (I) or at least two compounds (I), as a perfume with a lily of the valley-note, as an agent for increasing substantivity and/or retention of a perfume composition and/or as a fixative, is claimed. n : 0 or 1 either R1, R2 : 4-9C alkyl (linear and saturated) or R1+R2+C that is arranged between R1 and R2 : cyclohexyl moiety of formula (IIa) and R3-R5 : H, CH 3, ethyl, isopropyl or tert-butyl or R1 : H and R2 : 4-9C alkyl (branched and saturated), (IIa) or phenyl moiety of formula (IIb) and R3-R5 : H, CH 3, ethyl or isopropyl (when n = 1) or R1+R2+C that is arranged between R1 and R2 : (IIb) and R3-R5 : H, CH 3, ethyl, isopropyl or tert-butyl (when n = 0) and a, b : bond that connects (IIa) with adjacent O (when R1+R2+C = (IIa)), bond that connects (IIa) with adjacent C (when R2 = (IIa)), bond that connects (IIb) with adjacent C (when R2 = (IIb)) or bond that connects (IIb) with adjacent O (when R1+R2+C = (IIb)). Provided that when n is 1, then the bonds that link carbon atom with R1 and R2, and a and b, in (I) represent single bond, when n = 0, then the bonds that link carbon atom with R1 and R2, and a and b, in (I) represent aromatic bonds, and cyclohexyl ring, phenyl ring and groups R3-R5 exhibit 6-10C. Independent claims are also included for: (1) 2-(4-isopropylcyclohexyloxy)acetaldehyde (2) 1-(2,2-diethoxyethoxy)-4-isopropylcyclohexane (3) 2-(3,5
