-continued  48  US 8,900,791 B2  47  0 /"--...._,/0H  (A26)  ¢  (A28)  o~s /"--...../OH  Q  (A29)  O~OH  cc;o  0  (A30)  OH  (A35)  0~ 8 /"--....../oH  Q  (A34)  O~OH  cc::o  tt  0 0  (A31)  ✓ ,:::;  (A27) S/"--...._,/OH  ¢  (A32)  0 /"--...._,/0H  ¢  S/"--...._,/OH  (A33)  ¢ 