Patent ID: 8772474

Claim:
A compound of Formula (I), or a pharmaceutically acceptable salt thereof: wherein: B 1 is selected from the group consisting of R G2 is an unsubstituted C 1-6 alkyl; R H2 is hydrogen or NH 2 ; X 1 is S (sulfur); R 1 is selected from the group consisting of —Z 1 —R 9 , an optionally substituted N-linked amino acid and an optionally substituted N-linked amino acid ester derivative; Z 1 is selected from the group consisting of O (oxygen), S (sulfur) and)N(R 10 ); R 2 and R 3 are hydrogen; R 4 is hydrogen or azido; R 5 is hydrogen; R 6 is selected from the group consisting of hydrogen, halogen, —OR 11 and —OC(═O)R 12 ; R 7 is halogen or an optionally substituted C 1-6 alkyl; R 8 is hydrogen; R 9 is selected from the group consisting of an optionally substituted alkyl, an optionally substituted alkenyl, an optionally substituted alkynyl, an optionally substituted cycloalkyl, an optionally substituted cycloalkenyl, an optionally substituted aryl, an optionally substituted heteroaryl, an optionally substituted heterocyclyl, an optionally substituted aryl(C 1-6 alkyl), an optionally substituted heteroaryl(C 1-6 alkyl) and an optionally substituted heterocyclyl(C 1-6 alkyl); R 10 is hydrogen; R 11 is hydrogen or an optionally substituted C 1-6 alkyl; and R 12 is an optionally substituted C 1-6 alkyl or an optionally substituted C 3-6 cycloalkyl.