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Mesityl oxide is a α,β-Unsaturated ketone with the formula CH3C(O)CH=C(CH3)2. This compound is a colorless, volatile liquid with a strong cat urine odor
M 1777 (OTTO) Mesityl oxide, 98% Cas 141-79-7 - used as a solvent and in the production of methyl isobutyl ketone by hydrogenation: