Patent ID: 8304529

Claim:
A composition comprising wherein A is selected from a halogen, OH, OCH 3 , H, tert-butyldimethylsilyl and 2′,3′-O-isopropylidene; B is selected from a halogen, OH, OCH 3 , NH 2 , N 3 , NO 2 , CF 3 , CHO, S, tert-butyldimethylsilyl, LNA, and 2′,3′-O-isopropylidene; R 1 is CH 3 or void; R 2 is selected from OH, OCH 3 and a halogen; n is 1, 2 or 3; when B is OH or OCH 3 , R 1 is void and R 2 is OH, then A is neither OH nor OCH 3 ; and wherein at least one of A or B is halogen.