Patent ID: 8133894

Claim:
A compound of formula (I) wherein: each R 1 is independently: i) hydrogen; ii) halogen; iii) cyano; or iv) C 1 -C 3 alkoxy; R 3 and R 4 are taken together to form a piperazin-1-yl ring, wherein said ring can be optionally substituted at the 4-position nitrogen atom by a unit chosen from: i) C 1 -C 15 alkyl; ii) C 3 -C 9 cycloalkyl; iii) C 1 -C 12 haloalkyl; iv) C 2 -C 15 alkenyl; v) C 2 -C 15 alkynyl; vi) acyl having the formula —C(═O)R, R is hydrogen or C 1 -C 3 alkyl; vii) C 2 -C 15 heteroalkyl, optionally substituted with C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, halogen, cyano, hydroxy, —C(═O)OH, —NH 2 ; —NHC(═O)R; —C(═O)NH 2 , phenyl, or combinations thereof; viii) phenyl; optionally substituted with C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, halogen, cyano, hydroxy, —C(═O)OH, —NH 2 ; —NHC(═O)R; —C(═O)NH 2 , phenyl, or combinations thereof; or ix) benzyl; optionally substituted with C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, halogen, cyano, hydroxy, —C(═O)OH, —NH 2 ; —NHC(═O)R; —C(═O)NH 2 , phenyl, or combinations thereof; R 5 and R 6 are each independently: i) C 1 -C 15 alkyl; ii) C 3 -C 9 cycloalkyl; iii) C 1 -C 12 haloalkyl; iv) C 2 -C 15 alkenyl; v) C 2 -C 15 alkynyl; vi) halogen; vii) cyano; or viii) hydroxy; or a pharmaceutically acceptable salt thereof.