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For reducing the gastrointestinal toxicity associated with ibuprofen, its carboxylic group was masked by synthesizing its amide conjugates with ethylenediamine and benzathine (4a, 4b, respectively) by carbodiimide assisted coupling method. In vitro hydrolysis of conjugates showed that they were stable in HCl buffer (pH 1.2) indicating that the prodrugs did not break in stomach and there was no release...
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