Patent ID: 8476450

Claim:
A compound according to formula VI: wherein R 1 is —NR N1 R N2 ; wherein R N1 is H, C 3-8 alkyl which may be substituted with hydroxyl, halo, or amino, or —CH 2 -A 1 or —CH 2 -A 2 ; R N2 is C 3-8 alkyl which may be substituted with hydroxyl, halo, or amino or —CH 2 -A 1 or —CH 2 -A 2 ; or A 1 is C 6-10 aryl or C 6-10 heteroaryl, which may be substituted with hydroxyl, halo, or amino; A 2 is C 6 aryl or C 6 heteroaryl, which may be substituted with hydroxyl, halo, or amino; and only one of R N1 or R N2 may be —CH 2 -A 1 ; R 6 is COR 11 wherein R 11 is OH; R 7 is H.