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Tetrahedron Letters > 2009 > 50 > 16 > 1812-1816
Tetrahedron Letters > 2009 > 50 > 6 > 636-639
Tetrahedron Letters > 2006 > 47 > 37 > 6641-6645
Tetrahedron > 2006 > 62 > 13 > 3128-3136
Tetrahedron Letters > 2006 > 47 > 8 > 1355-1358