C₈H₁₉N A colorless, clear liquid with amine aroma; either din- butylamine, (C₄H₉)₂NH, boiling at 160_C, insoluble in water, soluble in hydrocarbon solvents, or di-sec-butylamine, (CH₃CHCH₂CH₃)₂NH, boiling at 133_C, flammable; used in the manufacture of dyes.