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1,3-Butadiene is a colourless, non-corrosive, flammable gas with the molecular formula C4H6. It is slightly soluble in water, more soluble in methanol and ethanol, and readily soluble in common organic solvents such as cyclohexane. [1] 1,3-Butadiene is made from the processing of petroleum and has a mild gasoline-like odour. [1,2]