Patent ID: 7005448

Claim:
A compound having the structure as follows: wherein R 1 is hydrogen or C 1-4 alkyl; R 2 is hydrogen, C 1-4 alkyl, or R 1 and R 2 can together be (CH 2 ) 2-4 to complete a heterocyclic ring; R 3 is hydrogen, hydroxyl, C 1-4 alkoxy, or fluorine; R 4 is selected from C 1-4 alkyl, halogen, nitrile, C 1-6 alkylthiol, trifluoromethyl, C 1-4 alkyl substituted by HO or C 1-3 alkoxy, R 5 is hydrogen, halogen, C 1-4 alkoxy, nitrile, W is hydrogen or C(═O)C 1-8 alkyl.