Patent ID: 7220784

Claim:
A compound represented by the structural formula: wherein: X is fluorine; R 1 is selected from alkyl, CHO, alkoxy, NH 2 , NHR, NRR′, SR, or CF 3 ; R 2 and R 3 are independently selected from hydrogen, alkyl, alkoxy, hydroxyl, NH 2 , NHR, NRR′, SR, haloalkyl or halogen; R 4 and R 5 are independently selected from hydrogen, alkyl, CH 2 NHCOR″ or CH 2 CONHR″; and, R 6 , R 7 and R 8 are independently selected from alkyl or alkoxy; wherein R and R′ are independently selected from C 1-10 alkyl groups and R″ is a C 1-10 alkyl group, aryl group or heteroaryl group; or a salt, an ester, a free acid or base or a hydrate thereof.