noun:one of two or more compounds, radicals, or ions that contain the same number of atoms of the same elements but differ in structural arrangement and properties
synonyms: acid, acidity, agent
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(..) behave the same. For instance... I'm sorry... For instance... Thalidomide. The right-handed isomer of the drug Thalidomide is a perfectly fine good medicine to give to a pregnant woman to prevent morning sickness but, make the mistake of giving that same pregnant woman the left-handed isomer of the drug Thalidomide, and her child will be born with horrible birth defects. Which is precisely (..)