Task: Text Categorization
Input (English): This property is changed by the Walden inversion. Changing only this property for an alcohol involves using tosyl chloride and pyridine, then adding sodium acetate and THF, and finally adding potassium hydroxide and water. This property is not possessed by meso compounds, and it can be visualized using Fischer projections. Pasteur found this property in tartaric acid, and glycine is the only amino acid lacking it. A mixture of products with this property is said to be racemic. Molecules with this property are designated R or S in the CIP system. Name this concept of a compound's "handedness," which describes compounds with a non-superimposable mirror image.
Output (English): Science