Patent ID: 7232900

Claim:
A compound having the formula: wherein the subscripts n, m, p, and q are each independently an integer of from 0 to 6; R 4 and R 5 are independently selected from H and methyl; PG is allyloxycarbonyl (Aoc) or 2,2,2-trichloroethoxycarbonyl (Troc); R 6 and R 7 are independently selected from H, OH, (C 1 –C 4 ) oxyaliphatic groups, —PO 3 H 2 , —OPO 3 H 2 , —SO 3 H, —OSO 3 H, —NR 15 R 16 , —SR 15 , —CN, —NO 2 , —CHO, —CO 2 R 15 , —CONR 15 R 16 , —PO 3 R 15 R 16 , —OPO 3 R 15 R 16 , —SO 3 R 15 and —OSO 3 R 15 , wherein R 15 and R 16 are each independently selected from H and (C 1 –C 4 ) aliphatic groups and X is O or S.