Oxea

Undecanal, also known as undecyl aldehyde, is an organic compound with the chemical formula C₁₀H₂₁CHO. It is an eleven-carbon aldehyde. A colourless, oily liquid, undecanal is a component of perfumes. Although it occurs naturally in citrus oils, it is produced commercially by hydroformylation of decene.
It has been registered under the EU REACH scheme at >1000 tonnes by Oxea, which confirms the status as irritant.

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