A compound represented by the formula I wherein is indicating a double bond either at C4 or at C5, or single bonds, R1, R2, R3, R4 are independently selected from H or Me, and R5, R6 are independently selected from Me or Et, and wherein the compound is not 9-hydroxy-5,9-dimethyldec-4-enal or 9-hydroxy-5,9-dimethyldecanal. Said compounds are useful as perfume ingredients in personal care and household care products.