Patent ID: 7329762

Claim:
A compound of the Formula IV: or a pharmaceutically acceptable salt or stereoisomer thereof, wherein a is 0 or 1; b is 0 or 1; R 1 is selected from: 1) (C═O)C 1 -C 10 alkyl, and 5) (C═O)NR c R c′ , said alkyl is optionally substituted with one or more substituents selected from R 10 ; or R 3 , R 4 and R 8 are independently selected from: 1) H, and 2) C 1 -C 10 alkyl; R 10 are independently selected from: 1) (C═O) a O b C 1 -C 10 alkyl, 6) CO 2 H, 7) halo, 9) OH, 11) O a (C═O) b NR 12 R 13 , 17) (C═O) a O b C 3 -C 8 cycloalkyl, and 18) —OPO(OH) 2 ; R 10a is halogen; R 12 and R 13 are independently selected from: 1) H and 2) (C═O)O b C 1 -C 10 alkyl, R c and R c′ are independently selected from: H, (C 1 -C 6 )alkyl, heterocyclyl and (C 3 -C 6 )cycloalkyl.