|   Ph--O---O   
(1--(0--+---Ry  
(1--(0--Ry--(2  
Ry--(2--(1--(0  
|   Ry--(1--(0  
O---O---Ph  |   
|   Ry--(1--(0  
Ry--(2--(1--(0  
(1--(0--Ry--(2  
(1--(0--+---Ry  
