[1]Tetrahedron,1993,vol.49,p.8139-8146
[2]Tetrahedron,1993,vol.49,p.8139-8146
[3]Tetrahedron,1993,vol.49,p.8139-8146
[4]Tetrahedron,1993,vol.49,p.8139-8146
[5]Tetrahedron,1993,vol.49,p.8139-8146
[6]Tetrahedron,1993,vol.49,p.8139-8146
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