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In the formulas, R, R 11 , R 21 , n, Y and Y 2 are each the same as defined above, and X 1 represents a tertiary alkyl ester-type acid-dissociable group. 

In the above formulas, examples of X 1 include the same tertiary alkyl ester-type acid-dissociable groups as those described above. 

R 11 , R 21 , n andY are the same as defined above for R 11 , R 21 , n and Y respectively in general formula (pl) within the description relating to the "acetal-type acid-dissociable group". 

Examples ofY $^{2 }$include the same groups as those described above for Y $^{2 }$in general formula (al-0-2). 

Specific examples of the structural units represented by general formulas (al-1) to (al-4) are shown below. 

In the formulas shown below, R"’ represents a hydrogen atom, a methyl group or a trifluoromethyl group. 

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