Patent ID: 7342127

Claim:
A compound having the following Formula I: wherein X is selected from oxygen (—O—), selenium (—Se—), sulfur (—S—), sulfenyl (SO), sulfonyl (SO 2 ), carbonyl (—CO), methylene (—CH 2 —) and —NH—; R 1 is hydrogen; R 2 is C 1 to C 6 alkyl or C 3 to C 7 cycloalkyl; R 3 is hydrogen; R 4 is C 1 to C 4 alkyl R 5 is hydrogen; R 6 and R 7 are independently bromo, chloro or methyl; R 8 is halogen or C 1 to C 4 alkyl; R 9 is hydrogen or halogen; R 10 is hydrogen; R 11 is carboxyl; R 12 is hydrogen; and R 13 is hydrogen.