Oct. 8, 2020  13  US 2020/0319551 Al  -continued  LCl-20  LCl-21  LCl-22  (Rb2)n2  0  LCl-12  (Rb2)n2  ~’o  y  0  LCl-13  (Rb2)n2  $  0  LCl-14  (Rb2)n2  LCl-15  0  0  LCl-16  0 ~’,---( 0 )  (Rb2)n2  )-a  0  LCl-17  (Rb2)n2  LCl-18  (Rb2)n2  LCl-19  -continued  [0187]  In General Formulae (LCl-1) to (LCl-22), Rb$_{2 }$ represents a substituent.  [0188]  As the substituent (Rb$_{2}$ ),  an alkyl group having 1 to  8 carbon atoms, a hydroxyl group, a cycloalkyl group having  4 to 7 carbon atoms, an alkoxy group having 1 to 8 carbon  atoms, an alkoxycarbonyl group having 1 to 8 carbon atoms,  a carboxyl group, a halogen atom, a cyano group, or an  acid-decomposable group is preferable.  [0189]  In a case where these substituents further have a  substituent, the substituent is preferably a fluorine atom. For  example, the alkyl group having 1 to 8 carbon atoms is  preferably a fluoroalkyl group having 1 to 8 carbon atoms  (preferably a perfluoroalkyl group).  [0190]  n2 represents an integer of O to 4. In a case where  n2 is 2 or greater, a plurality of Rb$_{2}$ ’  s may be different from  each other, and the plurality ofRb$_{2}$ ’s may be bonded to each  other to form a ring.  [0191]  In addition, in a case where a lactone ring group  represented by lac is formed by removing two hydrogen  atoms from one methylene group in the lactone structure  represented by any one of General Formulae (LCl-1) to  (LCl-22) (preferably General Formula (LCl-1) or (LCl- 22)) to form a lactone ring group represented by lac. the one  methylene group from which two hydrogen atoms are to be  removed is not the methylene group included in the sub› stituent (Rb$_{2}$ ).  In addition, the one methylene group from  which two hydrogen atoms are to be removed is preferably  a methylene group included in a lactone ring.  [0192]  Repeating Unit c3  [0193]  The repeating unit c3 is a repeating unit having a  carbonate ring group.  [0194]  The carbonate ring group is a group formed by  removing a hydrogen atom from a carbonate ring.  [0195]  The carbonate ring is a ring including a carbonate  group, and is, for example, a ring represented by General  Formula (CBN). 