Patent ID: 7863315

Claim:
An isolated compound of formula I: wherein X is â•CHâ€” or â•Nâ€”Nâ•CHâ€”; R 1 , R 2 , R 3 and R 4 are independently hydrogen, halo, alkyl, alkoxy, nitro or trifluoromethyl; Ar is a benzene ring when X is â•CHâ€” or â•Nâ€”Nâ•CHâ€”, or 2,4-dimethyl-1H-pyrrole when X is â•Nâ€”Nâ•CHâ€”; R 5 is â€”NHOH or R 6 , R 7 , R 8 and R 9 are independently hydrogen, halo, alkyl, alkoxy or trifluoromethyl; and n is an integer ranging from 1 to 7.