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Butanol or n-butyl alcohol or normal butanol is a primary alcohol with a 4-carbon structure and the chemical formula C4H9OH. Its isomers include isobutanol, 2-butanol, and tert-butanol. Butanol is one of the group of "fusel alcohols
B 2289 (OTTO) 1-Butanol, for HPLC 99%+ Cas 71-36-3 - used for extraction of essential oils.