+++статья из Science Direct

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Studies directed toward synthesis of guanosine 8,5'-imino cyclonucleosides and derivatives—I

Tadashi Sasaki, Katsumaro Minamoto and Hidemi Itoh

Tetrahedron
Volume 36, Issue 24, 1980, Pages 3509-3515

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http://dx.doi.org/10.1016/0040-4020(80)88046-X

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