The effects a drug or chemical compound have on the body depend on how its atoms are arranged in space. Some compounds have a dark twin with the same molecular formula but different 3D structure – and this can have consequences for what they do or
– while one may help with cognition and memory, the other may be toxic to the nervous system.Many drugs have the same atoms and bonds but are arranged differently in space. These drugs are calledFor example, your hands are also nonsuperimposable mirror images of each other. Although they look the same, they don't overlap when you put one on top of the other.Usually these mirror-image versions have very similar properties because they share the same elements and bonds.
Just as you wouldn't be able to fit a left-handed glove on your right hand, a left-handed version of a drug wouldn't be able to fit into a target in the body shaped to fit a right-handed molecule.. This means that if you shine polarized light on a chiral molecule, one will rotate the light to the left while the other will rotate it to the right .
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