Patent ID: 7638503

Claim:
A compound of formula II: or pharmaceutically acceptable derivatives thereof, wherein R 1 , R 2 , R 3 and R 4 are each independently selected as follows: i) R 1 and R 2 are each independently selected from sulfate, phosphate and carboxylate; and R 3 and R 4 are hydrogen; ii) R 3 and R 4 are each independently selected from sulfate, phosphate and carboxylate; and R 1 and R 2 are hydrogen; iii) R 1 , R 2 and R 3 are each independently selected from sulfate, phosphate and carboxylate; and R 4 is hydrogen; iv) R 1 , R 2 and R 4 are each independently selected from sulfate, phosphate and carboxylate; and R 3 is hydrogen; v) R 2 and R 4 are each independently selected from sulfate, phosphate and carboxylate; and R 1 and R 3 are hydrogen; vi) R 1 is selected from sulfate, phosphate and carboxylate; and R 2 , R 3 and R 4 are hydrogen; vii) R 2 is selected from sulfate, phosphate and carboxylate; and R 1 , R 3 and R 4 are hydrogen; viii) R 3 is selected from sulfate, phosphate and carboxylate; and R 2 , R 4 and R 1 are hydrogen; or ix) R 4 is selected from sulfate, phosphate and carboxylate; and R 1 , R 2 and R 3 are hydrogen; with the provisos that (a) when R 1 is sulfate, then R 2 is other than H; (b) when R 2 is sulfate, then R 1 is other than H; and R 5 is selected from alkyl and optionally substituted alkenyl; and n is 0-100.