[1]JournalofOrganicChemistry,1988,vol.53,p.5170-5173
[2]Patent:US4962193,1990,A
[3]JournalofMedicinalChemistry,2004,vol.47,p.1847-1851
[4]ChemMedChem,2015,vol.10,p.94-106
[5]OrganicandBiomolecularChemistry,2009,vol.7,p.2548-2553
[6]BioorganicandMedicinalChemistryLetters,2007,vol.17,p.3666-3669