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6-[[2’-[(5,5’-dimethyl-1,3,2-dioxaphosphorinan-2-yl)oxyl]-3,3’-bis(l,1 -dimethylethyl)-5,5’-dimethoxy [1,1’-bipbenyl]-2-yl]oxy]-4,8-bis(l,1-dimethylethyl)-2,10-dimcthoxydibenzo[d,f][l,3,2]dioxaphosphepin having the formula: 

<img src='content_image/941303.jpg'>

2’-[[4,8-bis(l,1-dimethylethyl)-2,10-dimethoxydibenzo[d,f][l,3,2]-dioxaphosphepin-6-yl]oxyl]- 3,3’ -bis(l ,1-dimethylethyl)-5,5’ -dimethoxy[ 1,1’-bipbenyl]-2-y I bis( 4-hexy lphenyl)ester of phosphorous acid havin,g the formula: 

<img src='content_image/941304.jpg'>

-continued 

LigandN 

LigandO 

