Patent ID: 7166619

Claim:
A compound having the formula: or a pharmaceutically-acceptable salt thereof, wherein: R 1 is phenyl, benzyl, methyl, ethyl, propyl, 3,4-dimethylphenyl, 3,4-difluorophenyl, 3,4-dichlorophenyl, 3,5-dichlorophenyl, CH 2 CF 3 , 4-trifluoromethylphenyl, 4-nitrophenyl, 4-bromophenyl, 3-bromophenyl, 4-methylphenyl, 4-methoxyphenyl, 4-chloro-2-methylphenyl, 4-fluorophenyl, 4-sulfonamidophenyl, 3-methoxyphenyl, 4-chlorophenyl, 3-chlorophenyl, 3,5-difluorophenyl, 4-aminophenyl, ethanol, or 3,4-methylenedioxyphenyl; R 2 is pyridine or pyridine-1-oxide; R 3 is H, CH 2 CH 2 OH, CH 2 CH 2 OCH 3 , CH 2 CH 2 N(CH 3 ) 2 , CH 2 CH 2 NHCH 3 , CH 2 OH, (CH 2 ) 3 OH, CH 2 CH 2 CO 2 H, CH 2 CO 2 H, CH 2 CH 2 SOCH 3 , CH 2 CH 2 SO 2 CH 3 , CH 2 CH 2 SH or CH 2 CH 2 SCH 3 ; R 4 H, NH 2 , CON(CH 3 ) 2 , NH 2 CO 2 H CN, CH 2 OH, CONH 2 , CSNH 2 , CONHOH, C(NH)NH 2 , CONHNH 2 , CONHCH 3 , CH 2 OCH 3 , CONH-cyclohexyl, CO 2 CH 3 , or R 5 is H, isopropyl, benzyl, 4-trifluoromethylbenzyl, 4-cyanobenzyl, 4-benzoylbenzyl, 3-chlorobenzyl, pentafluorobenzyl, 3,4-dichlorobenzyl, 2-fluorobenzyl, 4-methoxybenzyl, CH 2 CH 2 -phenyl, 4-fluorobenzyl, 4-phenylbenzyl, CH 2 COOH, CH 2 CH 2 COOH, (CH 2 ) 4 NH 2 , CH 2 CH 2 SCH 3 , 4-hydroxybenzyl, CH 2 -naphthyl, 4-methylbenzyl, CH 2 -cyclohexane, 4-chlorobenzyl, phenyl, 2-hydroxybenzyl, 4-tertbutoxybenzyl, 4-aminobenzyl, CH 2 OH, (CH 2 ) 3 NHC(NH)NH 2 or CH 2 CH(CH 3 ) 2 ; and, R 6 is H, methyl, ethyl, propyl, isopropyl, CH 2 CO 2 H, CH 2 CO 2 Et, benzyl, or CH 2 -(2-methoxynaphthyl); or, R 5 and R 6 together form: