Patent ID: 8492427

Claim:
A compound of formula I: or a salt thereof, wherein: Z 1 is CR 1 R 1a or NR A ; R 1 and R 1a are independently selected from H, C 1 -C 3 alkyl, CF 3 , CHF 2 , CN or OR A ; Z 2 is CR 2 or N; R 2 is H, C 1 -C 3 alkyl, halo, CF 3 , CHF 2 , CN, OR A or NR A R A ; each R A is independently H or C 1 -C 3 alkyl; Z 3 is CR 3 or N; R 3 is selected from H, halo, CN, CF 3 , or C 1 -C 12 alkyl; R 4 is H; Y is W—C(O)—; W is R 5 is H or C 1 -C 12 alkyl; X 1 is —OR 11′ ; each R 11′ is independently H or C 1 -C 12 alkyl; R 6 and R 6′ are independently H or halo provided that R 6 and R 6′ are not both H at the same time; p is 0, 1, 2or 3; n is 0, 1, 2 or 3; wherein each said alkyl of —R 11′ is independently optionally substituted with one or more —(CR 19 R 20 ) n OR 16 ; each R 16 is H; and R 19 and R 20 are independently selected-from H or C 1 -C 12 alkyl.