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One-pot, multicomponent reaction for the synthesis of 4-aryl-5-cyano-1,6-dihydro-2-thiouracils via three-component from aromatic aldehydes, ethyl 2-cyanoacetate and S-benzylisothiourea hydrochloride (methyl carbamimidothioate sulfate) under methanol is described. These compounds have many drug activities, such as anti-hepatitis C viral, anti-Severe acute respiratory syndrome and anti-HIV-1 integrese activity. The advantages of this procedure include the short reaction time, mild reaction conditions and excellent yields.

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