30  US 9,217,919 B2  29  -continued  an acid.  . I  (8) any rep~lillg h olic hydroxyl  A the repeating u~1 h  ; g at least one p en  s  .  umt avm  as it is a repeatmg  . (B)•  . (P) is a repeat- (2) Repeating Umt.  .)  ntained in the resm  p a part or  .  umt(B co  . h droxylgrou ’  h  The repeatmg  e phenolic y  groups eac  .  t least on  1  group or  .  f  .  unit havmg a  f the hydroxy  .  by the act10n o  ~~f  of hydrogen ato:;riup capable ofleavmg  being protected by  .  unit is useful so far  -continued 