Patent ID: 6800765
Filing Date: 2004-10-05
Classification: C07D,G01N

Abstract:
A compound having the formula wherein R1 and R2 are independently C1-C12 alkyl that is optionally substituted one or more times by C1-C6 alkoxy or halogen, provided that the alpha-carbon of the alkyl is not halogenated;R3 and R4 are independently C1-C6 alkyl; and R5-R8 are independently hydrogen, halogen, C1-C6 alkyl, C1-C6 alkoxy, sulfonic acid, ester of sulfonic acid, carboxylic acid, ester of carboxylic acid, â€”Lâ€”RX, or â€”Lâ€”SC, where L is a covalent linkage, RX is a reactive functional group, and SC is a conjugated substance; provided that at least one of R5-R8 is sulfonic acid, ester of sulfonic acid, carboxylic acid, ester of carboxylic acid, â€”Lâ€”RX, or â€”Lâ€”SC.