Patent ID: 7235564

Claim:
A compound of Formula (I) as follows: where: R 1 is: alkyl; alkenyl; alkynyl; aryl; Cl; Br; F; CN; SO 2 NHNH 2 ; SO 2 NR 5 NH 2 ; SO 2 NR 5 NHR 6 ; SO 2 NHNHR 5 ; SO 2 NHNR 5 R 6 ; CO 2 R 5 ; SR 5 ; SSR 5 ; SOR 5 ; SO 2 R 5 ; SO 2 NHR 5 ; SO 2 NR 5 R 6 ; B(OR 5 ) 2 ; CF 3 ; SH; SO 2 NH 2 ; NH 2 ; NHR 5 ; NHCOR 5 ; NHSO 2 R 5 ; NR 5 R 6 ; NR 5 COR 6 ; or NR 5 SO 2 R 6 ; R 5 and R 6 can form a ring; R 2 =alkyl or CH(O); R 3 =hydrogen, alkyl, or C(O)R 5 ; R 4 =hydrogen or C(O)R 5 ; R 5 and R 6 each are independently alkyl, alkenyl, alkynyl, or aryl; X=OR 5 , NR 5 R 6 , NHNH 2 , NHNHC(O)R 5 , OH, NHR 5 , NH 2 , or NHNHC(O)H; R 4 and X may be linked together with intervening atoms to form a ring; or a pharmaceutically acceptable salt thereof, wherein the alkyl and alkenyl groups may be branched or straight.