Patent ID: 8088954

Claim:
Compound according to Formula (IX) and salts thereof, wherein R 1 and R 2 are each independently selected from H and hydrocarbon moieties, which hydrocarbon moieties optionally comprise one or more heteroatoms, and which hydrocarbon moieties optionally comprise substituents, or when the compound according to formula (IX) is a salt, R 1 and/or R 2 may be a cation, R 3 and R 4 each independently are selected from the group of C 1 -C 6 alkyl and R 5 is selected from H, C 1 -C 6 alkoxyls, tri(C 1 -C 6 alkyl)silyls, C 1 -C 6 alkyls, and wherein R 1 and R 2 are optionally linked together to form a ring structure.