Patent ID: 7683208

Claim:
A bridge compound with an N,N-dialkylamino group of the following formula (I), wherein, R and R′each independently are selected from the group consisting of hydrogen, halogen, hydroxyl, carboxyl, sulfo, nitro, cyano, C 1-4 alkyl, C 1-4 alkoxy, ureido and amido; R 1 and R 2 each independently are hydrogen, or C 1-4 alkyl; R″ is hydrogen, C 1-4 alkylcarbonyl, phenyl, C 1-4 alkyl, or C 1-4 alkyl substituted by halogen, hydroxyl, carboxyl or sulfo; B and B′ each independently are selected from the group consisting of —SO 2 — and —CONH—(CH 2 ) n —SO 2 —; i and j are integers independent of one another between 0 to 3; and m and n are integers independent of one another between 2 to 4.