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inactive valeric acid
From The Collaborative International Dictionary of English v.0.48:
Valeric \Va*ler"ic\, a. (Chem.) Valerianic; specifically, designating any one of three metameric acids, of which the typical one (called also inactive valeric acid), C4H9CO2H, is obtained from valerian root and other sources, as a corrosive, mobile, oily liquid, having a strong acid taste, and an odor of old cheese. [1913 Webster] Active valeric acid, a metameric variety which turns the plane of polarization to the right, although formed by the oxidation of a levorotatory amyl alcohol. [1913 Webster]