+++3 статьи Bioorg.Med.Chem.Let. ...оперативно однако

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Здраствуйте. Помогите пожалуйста со следующими статьями:
1. Pleuromutilin derivatives having a purine ring. Part 1: New compounds with promising antibacterial activity against resistant Gram-positive pathogens
Bioorganic & Medicinal Chemistry Letters, Volume 18, Issue 12, 15 June 2008, Pages 3556-3561
Yoshimi Hirokawa, Hironori Kinoshita

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http://dx.doi.org/10.1016/j.bmcl.2008.05.011

2. Pleuromutilin derivatives having a purine ring. Part 2: Influence of the central spacer on the antibacterial activity against Gram-positive pathogens
Bioorganic & Medicinal Chemistry Letters, Volume 19, Issue 1, 1 January 2009, Pages 170-174
Yoshimi Hirokawa, Hironori Kinoshita

Код: Выделить всё

 http://dx.doi.org/10.1016/j.bmcl.2008.10.123

3. Pleuromutilin derivatives having a purine ring. Part 3: Synthesis and antibacterial activity of novel compounds possessing a piperazine ring spacer
Bioorganic & Medicinal Chemistry Letters, Volume 19, Issue 1, 1 January 2009, Pages 175-179
Yoshimi Hirokawa, Hironori Kinoshita

Код: Выделить всё

http://dx.doi.org/10.1016/j.bmcl.2008.10.127

Заранее спасибо .

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