content_image/909272.jpg content_image/909273.jpg content_image/909274.jpg
<img src='content_image/909272.jpg'>

-continued 

<img src='content_image/909273.jpg'>

Examples of the monomer from which recurring units (b3) of sulfonium salt in formula (2) are derived are shown below. 

<img src='content_image/909274.jpg'>

-continued 

