Patent ID: 8754244

Claim:
A compound of formula (I) and mesomers thereof: Wherein M +/− is a common counter ion, k is an integer of from 0 to 6, q is an integer of from 1 to 6, R 1 is H or an alkyl, aryl or substituted alkyl or substituted aryl group, R 2 is H, alkyl or substituted alkyl group, halogen, carboxy, carboxamide, hydroxy- or alkoxy group, or R 2 together with R 1 or R 5 is a carbon or heterosubstituted chain forming a ring, R 3 is H, alkyl or substituted alkyl group, halogen, carboxy, carboxamide, hydroxy- or alkoxy group or R 3 together with R 4 or R 6 is a carbon or heterosubstituted chain forming a ring, R 4 is H or an alkyl, aryl or substituted alkyl or substituted aryl group, R 5 and R 6 are H, alkyl or substituted alkyl group, halogen, hydroxy- or alkoxy group, R 8 is H, halogen, hydroxy- or alkoxy group, alkyl or substituted alkyl group or together with R 1 is a carbon or heterosubstituted carbon chain forming a ring, R 9 is H, halogen, hydroxy- or alkoxy group, alkyl or substituted alkyl group or together with R 4 is a carbon or heterosubstituted carbon chain forming a ring, R 7 is OR 11 or NR 11 R 12 where R 11 and R 12 are independently H, alkyl or a substituted alkyl, R 13 is OR 14 or NR 14 R 15 where R 14 and R 15 are independently H, alkyl or a substituted alkyl; aryl or a substituted aryl, and R 16 and R 17 are independently H or an alkyl, aryl or substituted alkyl or substituted aryl group.