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This principle encourages the design and therefore the use of less hazardous or toxic chemicals.
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In research, in chemical industries, drug developers always look towards using chemicals that are chiral.
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These are molecules that have a particular shape.
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This minimizes the unwanted side-effects that some drugs can have.
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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.
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Drug industries try to produce medicines, whereby a hundred percent of the drug produced is chiral.
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This fulfills another role of green chemistry by minimizing the amount of unwanted products ie drugs that have the wrong chirality.
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Carefully tweaking parts of a drugs design can also be useful,
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as drug designs can be used to target specific organs making the drug less likely to have unwanted side-effects.