A “chemical reaction” is a process (including a biochemical process) which results in a molecule with a new structure by breaking intramolecular bonds and by forming new intramolecular bonds, or by altering the spatial arrangement of atoms in a molecule.    The following processes should not be considered for purposes of origin:      dissolving in water or other solvents;      the elimination of solvents including solvent water; or      the addition or elimination of water of crystallization.’.      ,


ex 2914,    Diacetone alcohol      Methyl isobutyl ketone      Mesityl oxide    ,Manufacture from acetone,Manufacture in which a chemical reaction is made ,
2915,Saturated acyclic monocarboxylic acids and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives, except for:,Manufacture from materials of any heading. However, the value of all the materials of headings 2915 and 2916 used may not exceed 20 % of the ex-works price of the product,Manufacture in which the value of all the materials used does not exceed 40 % of the ex-works price of the product,
,    Acetic anhydride, ethyl and n-butyl acetate, vinyl acetate, isopropyl and methylamyl acetate, mono-, di- or trichloroacetic acids, their salts and esters    ,Manufacture from materials of any heading. However, the value of all the materials of heading 2916 used may not exceed 20 % of the ex-works price of the product,Manufacture in which a chemical reaction is made ,