Patent ID: 7582616

Claim:
A compound of the following formula, and analogs thereof: wherein: R 1 is H, OH, NH 2 , N 3 , halogen; R 2 is H, OH, NH 2 , N 3 , halogen; R 3 is H, NH 2 , substituted amino, halogen; R 4 is H, OH, NO 2 , CN, N 3 , NCS, halogen; R 5 is H, OH, NO 2 , CN, N 3 , NCS, halogen, halogen-CH 2 COCH 3 ; R 6 is H, OH, NO 2 , CN, N 3 , NCS, halogen, halogen-CH 2 COCH 3 ; R 7 is H, OH, NO 2 , CN, N 3 , NCS, halogen; R 8 is H, OH, OCH 3 , NO 2 , CN, N 3 , NCS, halogen, A-Reporter where A is O, S, NH, and the Reporter is a tethered reporter group; provided that substituents R 4 , R 5 , R 6 , R 7 , cannot all be H at the same time if R 1 is H, R 2 is OH, R 3 is H and R 8 is OH.