Cuminaldehyde (4-isopropylbenzaldehyde) is a natural organic compound with the molecular formula C10H12O.

Cuminaldehyde is a constituent of the essential oils of eucalyptus, myrrh, cassia, cumin, and others.

[1] It has a pleasant smell and contributes to the aroma of these oils.

It has been shown that cuminaldehyde, as a small molecule, inhibits the fibrillation of alpha-synuclein,[2] which, if aggregated, forms insoluble fibrils in pathological conditions characterized by Lewy bodies, such as Parkinson's disease, dementia with Lewy bodies[3] and multiple system atrophy.

[4] Cuminaldehyde can be prepared synthetically by the reduction of 4-isopropylbenzoyl chloride or by the formylation of cumene.