Patent ID: 7521584

Claim:
A chemical compound having the structure; where each R 3 independently hydrogen or methyl; where each R 1 and R 2 are independently: wherein each substituent —W is independently —OX or —OC(O)R, wherein each —X is independently -alkyl-NR 5 3 + , -aryl-NR 5 3 + , -alkyl-CO 2 H, -alkyl-CO 2 − , -aryl-CO 2 − , -amino acid-NH 3 + , -alkyl-O—PO 2 − -phosphorylated amino acid-NH 3 + , polyethylene glycol, dextran, benzyl, aryl; wherein each R 4 is independently -alkyl-NR 5 3 + , -aryl-NR 5 3 + , -alkyl-CO 2 − , -aryl-CO 2 − , -amino acid-NH 3 + , -phosphorylated amino acid-NH 3 + , polyethylene glycol, dextran, H, alkyl, aryl, or alkali salt; wherein each R 5 is independently H, alkyl, or aryl; wherein each R 6 is independently H, alkyl, benzyl, or alkali salt; wherein each —R is independently -alkyl-NR 5 3 + , -alkyl-NR 5 2 , -aryl-NR 5 3 + , -alkyl-CO 2 − , -alkyl-CO 2 R 7 , -alkyl-CO 2 R 8 , —OR 8 , -aryl-CO 2 − , -amino acid-NH 2 , -amino acid-NH 3 + , -phosphorylated amino acid-NH 3 + , polyethylene glycol, dextran, H, or aryl, -alkyl-O—PO 2 —O-alkyl-NR 5 3 + , wherein R′ is alkyl-O, or aryl; wherein R 7 is alkyl, —CH 2 —CH(OH)—CH 2 —O—PO 2 —O-alkyl-NR 5 3 + , wherein R 8 is -alkyl-NR 5 3 + , -aryl-NR 5 3 + , -alkyl-CO 2 − , -aryl-CO 2 − , -amino acid-NH 3 + , -phosphorylated amino acid-NH 3 + , polyethylene glycol, dextran, H, alkyl, or aryl.