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- [4] Synthesis and Antiviral Activity of Ureides and Carbamates of Betulinic Acid and Its Derivatives Russian Journal of Bioorganic Chemistry, 2003, 29 : 594 - 600
- [7] Synthesis and Antiviral Activity of Hydrazides and Substituted Benzalhydrazides of Betulinic Acid and Its Derivatives Russian Journal of Bioorganic Chemistry, 2003, 29 : 296 - 302