%0 Journal Article %T Synthesis and Inhibiting Activity of Some 4-Hydroxycoumarin Derivatives on HIV-1 Protease %A Stancho Stanchev %A Frank Jensen %A Anton Hinkov %A Vasil Atanasov %J ISRN Pharmaceutics %D 2011 %I Hindawi Publishing Corporation %R 10.5402/2011/137637 %U http://dx.doi.org/10.5402/2011/137637