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Butanol is a higher alcohol with a 4 carbon atoms and a general formula of C4H10O. There are 4 different isomeric structures for butanol:

1-Butanol skeletal.svg Butan-2-ol-2D-skeletal.png Isobutanol-2D-skeletal.png Tert-butanol-2D-skeletal.png
n-butanol sec-butanol isobutanol tert-butanol

These butanol isomers, due to their different structures, have somewhat different melting and boiling points. All are moderately miscible in water and used as a base for perfumes. For the purposes of distillation, butanol is considered to be a fusel oil. Like most alcohols, they are poisonous.