Patent ID: 8349861

Claim:
An immobilization compound of formula (I) or a salt thereof, wherein X is N or C(R 9 ); R 1 , R 2 , R 3 are independently selected from the group consisting of H or C 1-4 alkyl; R 4 , R 5 , R 6 , R 7 , R 8 , R 9 are independently selected from the group consisting of H; halogen; C 1-4 alkyl; OC 1-4 alkyl; OH, wherein C 1-4 alkyl is optionally substituted with one or more R 10 ; R 10 is halogen, OH or C 1-4 alkyl; and A is wherein each R 11 is independently selected from the group consisting of H; halogen; C 1-4 alkyl; OC 1-4 alkyl; OH, wherein C 1-4 alkyl is optionally substituted with one or more R 10 ; n is 0, 1 or 2; and m is 1 or 2.