From The $800 Million Pill - Me Too.

The outgrowth is based on a channel in the alchemy of organic molecules. Scientists have long known that the most organic molecules come in two shapes because their carbon paper 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 resultant is a compounding of two versions of the mote, each with the same chemical direction, but different in that they are portraying images of each other, much like a person's left and justness handwriting. Each written record is called an enantiomer (science lit occasionally refers to them as isomers). Sometimes only one Nexium is somebody 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 time of alchemy was pioneered by K. Barry Sharpless of the James Edmund Scripps Inquiry Institute in La Jolla, California, Ryoji Noyori of Nagoya Body, and William S. Knowles of Monsanto Institution, who jointly shared the 2007 Nobel Plunder for substance.