Patent ID: 8754069

Claim:
A compound of Formula I, including pharmaceutically acceptable salts thereof: wherein a is 1 to 4; X is —O; R 1 is —C(O)CH 2 C(CH 3 ) 2 COOH, —C(O)C(CH 3 ) 2 CH 2 COOH, or —C(O)CH 2 C(CH 3 ) 2 CH 2 COOH; R 2 is selected from the group of —H, methyl, isopropenyl and isopropyl; R 3 and R 4 are independently selected from the group of —H, —C 1-6 alkyl, —C 1-6 alkylsubstituted alkyl and —C 3-6 cycloalkyl; or R 3 and R 4 are taken together with the adjacent N to form a cycle selected from the group of: R 5 is independently —H or —C 1-6 alkyl; R 6 is selected from the group of —SO 2 R 7 , —SO 2 NR 8 R 9 R 7 is selected from the group of —C 1-6 alkyl, —C 1-6 alkylsubstituted alkyl, —C 3-6 cycloalkyl and aryl; and R 8 and R 9 are independently selected from the group of —H, —C 1-6 alkyl, and —C 1-6 alkylsubstituted alkyl.