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                                    One of the following ring systems can be used as the bioisosteric replacement benzene ring in drug design | 
                            
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Answer»  Answer: The REPLACEMENT of para-substituted benzenes with saturated BI- and polycyclic bioisosteres – bicyclo[1.1. 1]pentane, bicyclo[2.2. 2]OCTANE and cubane, – often increases the potency, selectivity and metabolic stability of BIOACTIVE compounds.  | 
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