Patent ID: 7667048

Claim:
A fluorescent compound of the structure wherein R is chosen from any of alkyl, alkenyl, alkylaryl, aromatic, or alkoxy groups which can be substituted by various constituents including but not limited to amino, carboxyl, hydroxyl, sulfonamide, or hydroxyl moieties, R4 is chosen from —H, —CH 3 , alkyl, alkenyl, aromatic, or alkylaryl groups which can, be substituted with any of several substitutions along the carbon chain, including but not limited to amino, carboxyl, hydroxyl, sulfonamide, or hydroxyl moieties, X is chosen from one of (CH 2 ) n , aryl-(CH 2 ) n , PEG, DEXTRAN, (CH 2 ) n —CONH—(CH 2 ) n , (CH 2 ) n —CONH-Z, where n=1-15, Z=PEG, DEXTRAN or a polypeptide, which can bear any of several substitutions along the carbon chain, including but not limited to amino, carbonyl, carboxyl, hydroxyl, sulfonyl, sulfonamide, oxyethylene, ethylene oxide, or hydroxyl moieties, and, Y is chosen from one of —NH 2 , —NCS, —SH, —OH, —COOH, —COONHS, -Maleimide, -hydrazide, CHO, biotinyl group, avidinyl group, or NHCOCH 2 I.