Patent ID: 8076287

Claim:
An isolated compound of Formula I: wherein, R 1 , R 2 and R 3 are each independently selected from H, R 8 and C(O)R 9 ; R 4 and R 5 are each independently selected from H, C 1-6 alkyl, C 1-6 alkenyl, and C 1-6 alkynyl; R 6 and R 7 are each independently selected from H, R 10 and C(O)R 11 ; R 8 and R 10 are each independently selected form C 1-6 alkyl, C 1-6 alkenyl, C 1-6 alkynyl, C 3-10 cycloalkyl, and C 3-10 heterocycloalkyl; R 9 and R 11 are each independently selected from H, C 1-6 alkyl, C 1-6 alkenyl, C 1-6 alkynyl, C 3-10 cycloalkyl, C 3-10 heterocycloalkyl, C 6-10 aryl, and C 5-10 heteroaryl, or C(O)R 9 and C(O)R 11 may independently be a C-coupled amino acid; wherein, when any of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 and R 11 comprises an alkyl, alkenyl, alkynyl, aryl, heteroaryl, cycloalkyl, or heterocycloalkyl group, then the alkyl, alkenyl, alkynyl, aryl, heteroaryl, cycloalkyl, or heterocycloalkyl group is optionally substituted with substituents selected from the group consisting of acyl, amino, acylamino, acyloxy, carboalkoxy, carboxy, carboxyamido, cyano, halo, hydroxyl, nitro, thio, C 1-6 alkyl, C 2-7 alkenyl, C 2-7 alkynyl, C 3-10 cycloalkyl, C 3-10 heterocycloalkyl, C 6-10 aryl, C 5-10 heteroaryl, alkoxy, aryloxy, sulfinyl, sulfonyl, oxo, guanidino and formyl; or an ether, an ester, an N-alkylated or N-acylated derivative, or a pharmaceutically acceptable salt thereof.