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Which outcome occurs when excessive torsion distorts the sigma bonds within a chiral drug molecule?

A)Increased receptor binding affinity
B)Racemization to an enantiomeric mixture
C)Accelerated kidney clearance rate
D)Enhanced blood-brain barrier permeability

💡 Explanation

Racemization occurs because sigma bond distortions lower the activation energy for interconversion via *inversion*, therefore conversion to a mixture of enantiomers results, rather than altered binding, permeability, or kidney clearance.

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