Patent ID: 8710230

Claim:
An isomer, racemate, enantiomer or diasteriomer of compounds of formula (I): wherein: R 4 is aryl optionally substituted with 1 to 3 substituents each independently selected from halo, (C 1-6 )alkyl, (C 2-6 )alkenyl, (C 1-6 )haloalkyl, (C 3-7 )cycloalkyl, —OH, —O(C 1-6 )alkyl, —SH, —S(C 1-6 )alkyl, —NH 2 , —NH(C 1-6 )alkyl and —N((C 1-6 )alkyl) 2 ; wherein the (C 1-6 )alkyl is optionally substituted with hydroxy, cyano or oxo; and R 6 and R 7 are each independently selected from H, halo, (C 1-6 )alkyl and (C 1-6 )haloalkyl; or a salt or an ester thereof.