Patent ID: 8354531

Claim:
A compound according to formula VIII.1: wherein: R 1 is H, C 1-6 -alkyl, C 2-6 -alkenyl, C 2-6 -alkynyl, C 6-10 -aryl, C 6-10 -aryl-C 1-6 -alkylene, or C 5-10 -heteroaryl-C 1-6 -alkylene; R 2 is H or an optionally mono- or polysubstituted group selected from C 1-6 -alkyl, C 2-6 -alkenyl, C 2-6 -alkynyl, an optionally mono- or poly-bridged mono- or bicyclic C 3-10 -cycloalkyl, C 6-10 -aryl, an aromatic or non-aromatic, heterocyclic C 3-10 ring, a bicyclic ring, and a C 6-10 -aryl fused to a C 3-10 heterocycle; or NR 1 R 2 together is a heterocyclic ring optionally substituted by one or more groups selected from C 1-4 -alkyl, C 2-6 -alkenyl, C 2-6 -alkynyl, straight-chain or branched C 1-6 -alkanol, and oxo.