Patent ID: 7498321

Claim:
A compound of formula (I) wherein R 1 represents C 1-6 alkyl or C 1-6 haloalkyl; R 2 represents —C(═O)-aryl or —C(═O)-heteroaryl, wherein said heteroaryl is a 5 member heterocyclic aromatic ring containing 1-3 hetero atoms selected from N and S, or a 5 member heterocyclic aromatic ring containing 2-3 hetero atoms selected from N, O and S, or a 6 member heterocyclic aromatic ring containing 1-3 hetero atoms selected from N, O and S; R 3 represents hydrogen, methyl (which may be in either the α or β configuration) or methylene; R 4 and R 5 are the same or different and each represents hydrogen or halogen; and represents a single or a double bond; or a salt or a solvate thereof.