REFERENCES
- Latypov , Sh. K. , Ferreiro , M. J. , Quiñoá , E. and Riguera , R. 1998 . J. Amer. Chem. Soc. , 120 : 4741
- Estrada , E. , Uriarte , E. , Montero , A. , Teijeira , M. , Santana , L. and De Clercq , E. 2000 . J. Med. Chem. , 43 : 1975 – 85 .
- δRS represents the difference between the chemical shift of determinated proton in the (R)- and (S)-derivatives (δRS = δR − δS)