Saturated acyclic monocarboxylic acids, their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives (excl. formic acid and acetic acid, mono, di or trichloroacetic acids, propionic acid, butanoic and pentanoic acids, palmitic, stearic and lauric acids and their salts and esters, and acetic anhydride)