Task: Text Categorization
Input (English): Le Bel and van't Hoff took advantage of this property to help determine the tetrahedral structure of carbon compounds. It is critical in pharmacology as it explains why only some methyl-dopa and ibuprofen molecules are effective. It also occurs in simpler molecules such as 2-butanol. The S and R labels are applied to enantiomers, pairs of molecules that demonstrate this concept. FTP, identify this term that indicates the molecular version of left- and right-handedness.
Output (English): Science