Patent ID: 7429660

Claim:
A compound of formula II: and isomers, salts, solvates, chemically protected forms, and prodrugs thereof, wherein: R 1 and R 2 together form, along with the nitrogen atom to which they are attached, an optionally substituted heterocyclic ring having from 4 to 8 ring atoms; R C1 is —NR 3 R 4 , where R 3 and R 4 are independently selected from hydrogen, optionally substituted C 17 alkyl groups, optionally substituted C 3-20 heterocyclyl groups and optionally substituted C 5-20 aryl groups, or together form, along with the nitrogen atom to which they are attached, an optionally substituted heterocyclic ring having from 4 to 8 ring atoms, or R C1 is of formula IIa: wherein R C2 is selected from an optionally substituted C 1-7 alkyl group, an optionally substituted C 3-20 heterocyclyl group, an optionally substituted C 5-20 aryl group, an ester group, an ether group and an amino group.