Correlation of cytotoxic activity of betulinines and their hydroxy analogues
        Correlation of cytotoxic activity of betulinines and their hydroxy analogues.        
                  Bioorganic & Medicinal Chemistry Letters.                
                  2005,
                
                              15(19),
                  
                              4196-4200,
                          
                  ISSN: 0960-894X,
                
                
                              PMID: 16051489,                          
                
        
        
      
    