Patent ID: 8481502

Claim:
A compound having the following structure (I): or a stereoisomer or pharmaceutically acceptable salt thereof, wherein: Q 1 is hydroxyl, a protected hydroxyl, amino or a protected amino group; Q 2 is: Q 5 is hydroxyl, a protected hydroxyl, amino or a protected amino group; each R 1 and R 2 is, independently, hydrogen or an amino protecting group; each R 3 is, independently, hydrogen or a hydroxyl protecting group; each R 4 and R 5 is, independently, hydrogen or C 1 -C 6 alkyl optionally substituted with one or more halogen, hydroxyl or amino; each R 6 is, independently, hydrogen, halogen, hydroxyl, amino or C 1 -C 6 alkyl; or R 4 and R 5 together with the atoms to which they are attached can form a heterocyclic ring having from 4 to 6 ring atoms, or R 5 and one R 6 together with the atoms to which they are attached can form a heterocyclic ring having from 3 to 6 ring atoms, or R 4 and one R 6 together with the atoms to which they are attached can form a carbocyclic ring having from 3 to 6 ring atoms; each n is, independently, an integer from 0 to 4; and each Z 1 and Z 2 is, independently, hydrogen or —OR 3 , wherein (i) at least one of Z 1 and Z 2 is H, (ii) at least one of R 4 and R 5 is substituted C 1 -C 6 alkyl or at least one R 6 is halogen, hydroxyl or amino, and (iii) the two adjacent —CH— groups to which Z 1 and Z 2 are attached may optionally form a double bond.