Patent ID: 8211919

Claim:
A compound of formula (I): wherein A is phenyl, cyclohexyl, or thienyl; L 1 is —H; L 2 is CH; L 3 is CH; L 4 is CR 2 ; R 1 and R 2 are each independently —H or taken together to form ethylene; X is —CHR 5 —X 1 —; X 1 is —NH— or —CHR 7 —; R 5 is lower alkyl which may be substituted with —OH or carboxy, —OH, —NH 2 , —C(O)NH 2 , —C(O)OR 8 , or —NHC(O)OR 9 ; R 7 is —H, morpholyl, —OH or —NR 10 R 16 ; R 8 , R 9 , R 10 , and R 16 are each independently —H or lower alkyl; or a pharmaceutically acceptable salt thereof.