Patent ID: 7345091

Claim:
A composition comprising a chemical compound having the structure where each R 3 is independently hydrogen or methyl; where each Y is independently O or H 2 ; where each X is independently -alkyl-NR 2 3 + , -aryl-NR 2 3 + , -alkyl-CO 2 − , -aryl-CO 2 − , -amino acid-NH 3 + , -phosphorylated amino acid-NH 3 + , polyethylene glycol, dextran, alkyl, or benzyl, where each R 1 is independently -alkyl-NR 2 3 + , -aryl-NR 2 3 + , -alkyl-CO 2 − , -aryl-CO 2 − , -alkyl-CO 2 H; -alkyl-CO 2 R 6 ; amino acid-NH 2 , -amino acid-NH 3 + , -phosphorylated amino acid-NH 3 + , polyethylene glycol, dextran, H, alkyl, aryl, or alkali salt; where each R 2 is independently H, alkyl, or aryl; and where each R 5 is independently H, alkyl, benzyl, or alkali salt.