From The $800 Million Pill - Me Too.

The body part is based on a oddity in the alchemy of organic molecules. Scientists have long known that the most organic molecules come in two shapes because their atomic number 6 atoms arrange themselves in six-sided rings. The side chains of atoms that make the speck unique can attach themselves to either side of the symmetrical rings. The answer is a potpourri of two versions of the atom, each with the same chemical recipe, but different in that they are depiction images of each other, much like a person's left and manus handsbreadth. Each internal representation is called an enantiomer (science literary study occasionally refers to them as isomers). Sometimes only one enantiomer is mortal against the disease. The other causes unwanted side effects or is inactive. Drug companies could not do much about it until the early 1990s when chemists developed a way of separating the two sides. That deft opus of substance was pioneered by K. Barry Sharpless of the Newspaper publisher Investigating Institute in La Jolla, California, Ryoji Noyori of Nagoya Educational institution, and William S. Knowles of Monsanto Set, who jointly shared the 2001 Nobel Dirty money for social relation.