Patent ID: 7211663

Claim:
A compound represented by structure 1: wherein X represents O; Y represents independently for each occurrence O; Z represents independently for each occurrence O; R is selected, independently for each occurrence, from the group consisting of heteroalkyl, aralkyl, heteroaryl, and heteroaralkyl; R′ is selected, independently for each occurrence, from the group consisting of H, alkyl, heteroalkyl, aryl, aralkyl, heteroaryl, heteroaralkyl, acyl, and sulfonyl; R″ is selected, independently for each occurrence, from the group consisting of H, alkyl hertoalkyl, aralkyl, heteroaryl, and heteroaralkyl; R 2 , R 3 , and R 4 are independently selected from the group consisting of R 6 , —OR′, —SR′, —NR′ 2 , —OSO 3 H, —OPO 3 H 2 ; R 5 is selected from the group consisting of R 6 , —(CR″ 2 ) n OR′, —(CR″ 2 ) n SR′, and —(CR″ 2 ) n NR′ 2 ; R 6 is selected,independently for each occurrence, from the group consisting of H, alkyl, heteroalkyl, aryl, aralkyl, heteroaryl, and heteroaralkyl; and n is an integer selected from the range 0 to 10 inclusive.