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[1]ChemischeBerichte,1990,vol.123,p.859-867
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[1]TetrahedronLetters,1999,vol.40,p.171-174
[2]Tetrahedron,2010,vol.66,p.3553-3563
[1]HelveticaChimicaActa,2003,vol.86,p.494-503
[1]TetrahedronLetters,1999,vol.40,p.171-174