Patent ID: 7179827

Claim:
A compound of formula (1): or a pharmaceutically acceptable salt, stereoisomer or solvate thereof, wherein: R 1 , R 2 , R 3 , R 4 and R 5 are each independently H, optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted heterocycloalkyl, optionally substituted heterocycle; optionally substituted arylalkyl, optionally substituted heterocycloalkylalkyl, or optionally substituted heteroarylalkyl; or R 1 and R 2 , and R 4 and R 5 , with the nitrogen atom to which they are attached, independently form an optionally substituted heterocycle.