R3 is 1 3 groups independently selected from the group consisting of lower alkyl, lower alkoxy, {TAIL ~ COOH}, {HEAD ~ NO2}, NR4 R5, OH or halogeno 
R3 is 1 3 groups independently selected from the group consisting of lower alkyl , lower alkoxy , { TAIL ~ COOH } , { HEAD ~ NO2 } , NR4 R5 , OH or halogeno
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH