US 2019/0064665 Al  12  Feb.28,2019  (a)  (b)  0  0  [0101]  In,.  iormulae ( )  methyl or t  .fl  a and (b)  RA  .  h  n uorometh I  zA  . ’  is  ydroge  fl  .  group, naphthyl  y .  is a sing!  b  n,  uonne  z•  eneg  eondh  ’  -, wherein Z’ i  rou~ or (backbone) C(’ p enylene  alkyl  s a straight b  - =0) o  ene group wh• h  ’ ranched  - - bond, ester bond ic  may contain ah  dr  or cycl)c C1 -C10  naphthylene grou o~la~tone ring, o/ph~:y~ mmety, ether  gen or a polar  p.  is an acid labile  y ene group or  from mnon  hgroup having at least  group.  yA  is hydro- b  g  ydroxyl  one structu  ond, ester b  , cyano  carb  re selected  lactone ring,  ~~f;  sulf~nic acid,ester  ~~:~  carboxyl, ether  [0102]  E  one =s and c,ri,oxylic ;;::y’:~date bond,  xmnples of h  I e.  wherein  zA  •  .  t e structur  h  .  h  1s a vari  t  e  avmg £  t ereto. Notabl  RA  an are shown be!  b  ormula (a)  y,  and  XA  are as defi owd,  ut not limited  ne  above. 