US 2020/0401045 Al  18  Dec. 24, 2020  -continued  ~  oyo~ $_{0}$A_}  -continued  [0226]  As the lactone structure or sultone structure, any  structure which has a lactone structure or sultone structure  may be used, but the structure is preferably a 5- to 7-mem› bered ring lactone structure or a 5- to 7-membered ring  sultone structure. Among those, the structure is more pref› erably a 5- to 7-membered ring lactone structure with which  another ring structure is fused in the form of forming a  bicyclo structure or a spiro structure or a 5- to 7-membered  ring sultone structure with which another ring structure is  fused in the form of forming a bicyclo structure or a spiro  structure.  [0225]  Furthermore, the resin (AX!) preferably includes a  repeating unit (hereinafter also referred to as a "repeating  unit C") having at least one selected from the group con› sisting of a lactone structure, a sultone structure, and a  carbonate structure.  [0224]  •  Repeating Unit C  [0223]  A content of the repeating unit B included in the  resin (AX!) (in a case where the repeating units B are  present in a plural number, a total content thereof) is  preferably 10% to 90% by mole, more preferably 20% to  80% by mole, and still more preferably 30% to 70% by  mole, with respect to all the repeating units of the resin  (AX!).  [0222]  Furthermore, the resin (AX!) may also include the  repeating unit having a group that decomposes by the action  of an acid to produce an alcoholic hydroxyl group as  described in paragraphs [0363] to [0364] of the specification  of US2016/0070167 Al as the repeating unit B.  [0221]  It is also preferable that the resin  (AX!)  includes  the repeating units described in paragraphs [0336] to [0369]  of the specification of US2016/0070167 Al as the repeating  unit B.  [0220]  The resin (A) may include the repeating unit B  singly or in combination of two or more kinds thereof.  [0227]  The resin (AX!) still more preferably has a  repeating unit having a lactone structure represented by 