[1]Patent:US6191309,2001,B1,
[1]Patent:US6191309,2001,B1,
[1]Tetrahedron,1993,vol.49,#22,p.4809-4820
[1]Tetrahedron,1993,vol.49,p.4809-4820
[1]Tetrahedron,1993,vol.49,p.4809-4820
[1]Tetrahedron,1993,vol.49,p.4809-4820
[1]Tetrahedron,1993,vol.49,p.4809-4820