108  107  isomer is mainly used, the optical purity ( ee) thereof is pref› erably 90 or higher, more preferably 95 or higher.  The content ratio of the repeating unit (D) based on all the  repeating units of the resin (P) is preferably in the range of0.5  to 80 mo! %, more preferably 1 to 60 mo! % and still more  preferably 2 to 40 mo! %. The repeating unit (D) can be used  either individually or in combination. The use of specified  lactone structures would ensure improvement in the line edge  roughness and development defect.  Specific examples of the repeating units (D) of the resin (P)  will be shown below, which however inno way limit the scope  of the present invention. In the formulae, Rx represents H,  CH$_{3}$ ,  CH$_{2}$0H  or  CF$_{3}$ .  Rx  :t  ~  0  ~o  ~  Qr  0  0  Rx  :t  0  Rx  :t  -continued  Rx  :t  HO  0  0  US 9,052,590 B2 