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Dana Hocková, Michal Hocek, Hana DvoIáková and Ivan Votruba. Synthesis and cytostatic activity of nucleosides and acyclic nucleoside analogues derived from 6-(trifluoromethyl)purines// Tetrahedron. Volume 55, Issue 36, 3 September 1999, Pages 11109-11118

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http://dx.doi.org/10.1016/S0040-4020(99)00615-8

Yun Ding, Yun-Yan Zhang, Jiong Zhang and Yao-Quan Chen. Syntheses and anticancer activity of ribonucleoside analogues containing thio-substituted five-membered heterocyclic base // Bioorganic & Medicinal Chemistry Letters. Volume 7, Issue 13, 8 July 1997, Pages 1607-1610

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http://dx.doi.org/10.1016/S0960-894X(97)00274-6

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