Butan-2-ol is a solvent. Solvents are substances, typically a liquid, in which other materials dissolve to form a solution. Solvents find various applications in chemical, pharmaceutical, oil, and gas industries, including in chemical synthesis and purification processes. Butan-2-ol is a drug precursor class 3 (The law enforcement and security (amendment) (EU Exit) regulations 2019 No. 742).