- strictly, a complex of two or more complete molecules in which each preserves its fundamental structure and no covalent bonds are made or broken (hydrates of salts, adducts);
- loosely, association of acids with basic organic compounds (amines with HCl);
- more loosely, addition of two molecules without the loss of any atom but resulting in formation of new covalent bonds (CH2=CH2 + Br2 ? BrCH2—CH2Br).
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Examples: glitazone, GI cocktail, etc.