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Duplicate or mirror?

Seven of the ten most frequent medications contain chiral agents. These are molecules that occur in right- or left-handed forms. During chemical synthesis both forms usually occur in equal parts and have to be separated afterward, because chirality determines the agent's effect in the body. Physicists have now succeeded in using laser light for the purpose of creating either right- or left-handed molecules.
Seven of the ten most frequent medications contain chiral agents. These are molecules that occur in right- or left-handed forms. During chemical synthesis both forms usually occur in equal parts and have to be separated afterward, because chirality determines the agent's effect in the body. Physicists have now succeeded in using laser light for the purpose of creating either right- or left-handed molecules.

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