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Kumamoto, Hiroki, et al. "A Novel Entecavir Analogue Constructing With a Spiro[2.4]heptane Core Structure in the Aglycon Moiety: Its Synthesis and Evaluation for Anti-hepatitis B Virus Activity." Nucleosides Nucleotides Nucleic Acids 2017.

Kumamoto, Hiroki, et al. "A Novel Entecavir Analogue Constructing With a Spiro[2.4]heptane Core Structure in the Aglycon Moiety: Its Synthesis and Evaluation for Anti-hepatitis B Virus Activity." Nucleosides Nucleotides Nucleic Acids 2017.