147  US 9,360,7 53 82  -continued  -continued  . .  monomer, a corre- h droxyl-contammg  has been  I n the case of a y  h. h the hydroxyl group  t c  •n w 1c  "bl t depro e - sponding monom~:/group which is susceptJ ~eo used and  replac~d by  ~~  a;pically ethoxyethoxy, _may ith weak acid  tion wit~ a~1 ’ be followed by deprotect10n :ay have been  polymenzat10n  .  1  the hydroxyl group  d  ter Alternative Y,  an wa  •  )yo  Jyo:  ~  (Y\  ~  V-l~  X  X  0  (): 0  I  :r 0  6=:r 0  ~  N  H  XX X  a  o~I  0  ~  0 HNY  HN  o  s-{  }-o  -{  O 0  0  X  A  ~  0  X  ~:()1  a=<  ~  0  X  ~  0 