Patent ID: 8871949

Claim:
A compound of the formula 1, wherein PG is a silyl protecting group; at least one of position 1, 2, 3, 4, 5, 6, 7 or 8 is bound to radical Y; and at least one of an available position 1, 2, 3, 4, 5, 6, 7 or 8 is bound to radical X; Y is R 1 is independently a (C 1 -C 8 )-alkyl; R 2 is selected from the group consisting of —C(O)NR—, —C(O)NR—(C 1 -C 8 )-alkyl-NR—, —NRC(O)— and —NRC(O)—(C 1 -C 8 )-alkyl-NR, and R is independently hydrogen or C 1 -C 8 -alkyl; X is —SO 3 —R 3 ; R 3 is independently selected from the group consisting of hydrogen, (C 1 -C 8 )-alkyl and (C 1 -C 8 )-alkyl-R 4 ; and R 4 is a polymer.