Patent ID: 7060105

Claim:
A compound of formulas (V) wherein M represents hydrogen, a metal cation or an ammonium cation, which optionally may be substituted by one or more alkyl or substituted alkyl or hydroxyalkoxyalkyl groups each having from 1 to 18 C atoms; R 1 represents alkyl having from 1 to 4 C atoms, substituted alkyl having from 2 to 4 C atoms, where the substituent is hydroxy; R 2 represents hydrogen or SO 3 M; R 3 represents hydrogen, SO 3 M, NH 2 , NHCOD 1 , where D 1 represents unsubstituted or substituted alkyl having from 1 to 6 C atoms, where the substituents are selected from the group consisting of carboxy, chloro or bromo; phenyl or substituted phenyl, where the substituents are selected from the group consisting of methyl, chloro, bromo, carboxy or sulfo; or NHSO 2 D 2 , where D 2 represents unsubstituted alkyl having from 1 to 6 C atoms, phenyl or substituted phenyl, where the substituents are selected from the group consisting of methyl, fluoro, chloro or bromo; R 4 represents hydrogen, SO 3 M, NH 2 or NHSO 2 D 3 , where D 3 represents alkyl having from 1 to 6 C atoms, phenyl or substituted phenyl where the substituents are selected from the group consisting of methyl, fluoro, chloro or bromo; R 5 represents hydrogen, SO 3 M, COOM or COND 4 D 5 , where D 4 and D 5 independently represent hydrogen, unsubstituted or substituted alkyl having from 1 to 6 C atoms, where the substituents are selected from the group consisting of methoxy, ethoxy, isopropoxy and hydroxy and R 6 represents hydrogen or SO 3 M.