The resulting primary amine is further oxidized to the carboxylic acid. Other components include other carboxylic acids, skatole, trimethyl amine, and isovaleric acid. Derivatization is possible by salt formation between an amine and a carboxylic acid. They arise from the reaction of carboxylic acid and an amine. Imines are susceptible to hydrolysis to the corresponding amine and carbonyl compound. The polymerization reaction with the amine group eliminates hydrogen chloride. New substrates based on dendrons with hydroxyl or amine peripheries show low toxicity. FITC is reactive towards nucleophiles including amine and sulfhydryl groups on proteins. The bisulfide anion is subsequently regenerated by heating of the amine sulfide solution. It is bifunctional, containing both a tertiary amine and primary alcohol functional groups. The reaction of converting primary aromatic amine into diazonium salt is called diazotisation. Sulfonamides are prepared by the reaction of a sulfonyl chloride with ammonia or an amine. The molecule is bifunctional, containing both a primary amine and a primary alcohol. Ephedrine is a sympathomimetic amine and substituted amphetamine. Diethanolamine is polyfunctional, being a secondary amine and a diol.