[1]Patent:US2003/78428,2003,A1
[2]Patent:US6310060,2001,B1
[3]Patent:US6251943,2001,B1
[4]Patent:US6696440,2004,B1
[5]Patent:US6696440,2004,B1
[6]Patent:US2004/171632,2004,A1
[7]Patent:US2004/171632,2004,A1
[8]BioorganicandMedicinalChemistryLetters,2008,vol.18,p.6501-6504