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← ScienceWhich 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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