Patent ID: 7714149

Claim:
A compound represented by the formula or its enantiomer: wherein X and X′ are independently selected from the group consisting of: O, and S; wherein each of Z 1 -Z 7 and Z 1 ′-Z 7 ′ is independently selected from the group consisting of: H, alkyl, aryl, substituted alkyl, substituted aryl, alkoxyl, aryloxyl, nitro, amide, halide, hydroxyl, carboxylate, heteroaryl, and a cyclic alkene, fused aryl, or cyclic ether group formed from any two adjacent Z groups or any two adjacent Z′ groups; wherein Y and Y′ are independently selected from the group consisting of: OH, OR, NH 2 , NHR, NR 2 , SH, PR 2 , OPR 2 , NHPR 2 , OP(OR) 2 , COOH, COOR, CONHR, and a linking group formed from Y and Y′ groups together and represented by the formula: wherein W is selected from the group consisting of: NR 2 and NHR: and wherein each R is independently selected from the group: a linear, branched or cyclic alkyl of 1-8 carbon atoms, substituted alkyl, aryl of 4-10 carbon atoms, substituted aryl, aralkyl, and alkaryl, each R group optionally having one or more stereogenic centers.