Patent ID: 6949528

Claim:
A compound of the following formula wherein each W is independently SH, OH, OCH 2 CH(NH 2 )CO 2 H, OCHCH 3 CH(NH 2 )CO 2 H, OPO 3 H 2 , OP(O)(OH)—O—PO 3 H 2 or Q, wherein when one W is Q, the other W is OH, and Q is one of the following structures: wherein Y is O or S; R is unsubstituted, saturated or unsaturated, straight or branched-chain alkyl, or ((CH 2 ) p O) q (CH 2 ) p T where q is an integer from 1 to 900 and where each p is independently an integer from 2 to 10 and T is OH, or O(CH 2 ) b CH 3 where b is an integer from 0 to 10; V is independently OH, SH, H, NH 2 , halogen, OPO 3 H 2 , or OSO 3 H; n is an integer from 2 to 10; m is an integer from 0 to 10; Z is OH, SH, halogen, H, O(CH 2 ) b CH 3 where b=0 to 2, or SO 3 H; L is independently O or S; and X is independently O or S.