Jul. 21, 2016  11  US 2016/0209749 Al  -continued  LCl-12  LCl-13  LCl-14  LCl-15  LCl-16  LCl-17  SLl-1  SLl-2  [0197]  The lactone structure portion or the sultone structure  portion may have or may not have a substituent (Rb$_{2}$ ).  Pref› erable examples of the substituent (Rb$_{2}$ )  include an alkyl  group having 1 to 8 carbon atoms, a cycloalkyl group having  -continued  LCl-5  LCl-6  LCl-7  LCl-8  LCl-9  LCl-10  LCl-11  0  0  ~~  II  0 