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by pocksuppet 20 days ago
They just can't use those compounds. Many medications have L and R forms of which only one is active. Right-methamphetamine is, well, methamphetamine, but left-methamphetamine is a nasal decongestant. Which is to say that the unwanted variation of a compound can be harmless.

Just about every molecule in every cell is already a maxwell's demon. They only fit together in specific ways.