Patent ID: 7923550

Claim:
A compound of the formula: wherein A is selected from the group consisting of —(OCH 2 CH 2 )—, —(OCH 2 CH 2 CH 2 )—, and grafted —(OCH 2 CH 2 ) n1 —(OCH 2 CH 2 CH 2 ) n2 —; B is selected from the group consisting of —(OCH 2 CH 2 )—, —(OCH 2 CH 2 CH 2 )—, and grafted —(OCH 2 CH 2 ) m1 —(OCH 2 CH 2 CH 2 ) m2 —; n is 1-50; n1 is 1-50; n2 is 1-50; m is 1-50; m1 is 1-50; m2 is 1-50; I—Pr is isopropyl; R 2 is selected from the group consisting of H, —CH 3 , alkyl, phenyl, —CH 2 CH 2 CN and CONH 2 ; R 3 is selected from the group consisting of H, —CH 3 , alkyl, phenyl, —CH 2 CH 2 CN and CONH 2 .