Patent ID: 7994166

Claim:
A compound of formula I: or a pharmaceutically acceptable salt thereof, wherein, independently for each occurrence: ring Z is a thiazole or thiadiazole optionally substituted with 0-2 occurrences of R; V is O or S; and R, R 1 , R 2 , and R 3 are hydrogen, C1-C6 aliphatic, aryl, C3-C8 cycloaliphatic, halo, CN, NO 2 , CF 3 , OCF 3 , OH, NH 2 , NH(C1-C6 aliphatic), N(C1-C6 aliphatic) 2 , COOH, COO(C1-C6 aliphatic), O(C1-C6 aliphatic), CHF 2 , or CH 2 F.