Patent ID: 7846920

Claim:
A compound having the structure shown in formula (A): wherein R 1 is a hydrocarbon group having 1 to 8 carbon atoms; R 3 is a phthalimido which can be optionally substituted with R 2 , wherein R 2 is one or more halogen, hydroxyl, nitro, cyano, alkyl, alkenyl, alkynyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, cycloalkenyl, heterocycloalkenyl, alkoxy, amido, amino, —CHO, —COOH, or COX, wherein X is Cl, F, Br, or I; and R 4 , R 5 , and R 6 are, independently, hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroalkyl, heteroaryl, cycloalkyl, heterocycloalkyl, cycloalkenyl, heterocycloalkenyl, halogen, hydroxyl, nitro, cyano, alkoxy, amido, amino, —CHO, —COOH, or COX, wherein X is Cl, F, Br, I; or any of which can be optionally substituted with R 2 , wherein R 2 is one or more halogen, hydroxyl, nitro, cyano, alkyl, alkenyl, alkynyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, cycloalkenyl, heterocycloalkenyl, alkoxy, amido, amino, —CHO, —COOH, or COX, wherein X is Cl, F, Br, or I; and wherein n=0 or 1; or a pharmaceutically acceptable salt, hydrate, ester or amide thereof.