19960
We review some of the key factors thought to control drug - receptor binding kinetics at the molecular level - molecular size , conformational fluctuations , electrostatic interactions and hydrophobic effects - and discuss several possible approaches for the rational design of drugs with desired binding kinetics .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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