ch 2 u2014 ch 2 u2014 o u2014 ch 2 g u2014 ch 2 u2014 nh 2 u2014 ch 2 h u2014 n r a u2014 ch 2 i u2014 co 2 t and u2014 ch 2 j u2014 n r b u2014 ch 2 u2014 ch 2 u2014 o u2014 ch 2 k u2014 ch 2 u2014 co 2 t w 2 is selected from the group consisting of u2014 cr c r d u2014 o u2014 u2014 nr c u2014 s u2014 and u2014 se a b d f h i and j independently vary from 1 5 c e g and k independently vary from 1 20 r a r b r c and r d are defined in the same manner as y 2 t is a negative charge in another embodiment the novel compositions of the present invention have the general formula 3 wherein r 15 r 16 r 17 r 18 r 19 r 20 r 21 r 22 r 23 y 3 and z 3 are independently selected from the group consisting of u2014 h c1 c5 alkoxyl c1 c5 polyalkoxyalkyl c1 c10 polyhydroxyalkyl c5 c20 polyhydroxyaryl mono and disaccharides nitro hydrophilic peptides.