 This principle encourages the design and therefore the use of less hazardous or toxic chemicals. In research and chemical industries, drug developers always look towards using chemicals that are chiral. These are molecules that have a particular shape. This minimizes the unwanted side effects that some drugs can have. Think about it like a pair of gloves. The right hand glove can only fit over your right hand and the left hand glove can only fit over your left hand. Drug industries try to produce medicines whereby 100% of the drug produced is chiral. This fulfills another rule of green chemistry by minimizing the amount of unwanted products, i.e. drugs that have the wrong chirality. Carefully tweaking parts of a drug's design can also be useful, as drug designs can be used to target specific organs making the drug less likely to have unwanted side effects.