wherein {HEAD ~ R1} represents linear or branched alkyl groups which have 1 to 7 carbon atoms, or {TAIL ~ aromatic groups} having the following general formula 
represents
wherein { HEAD ~ R1 } represents linear or branched alkyl groups which have 1 to 7 carbon atoms , or { TAIL ~ aromatic groups } having the following general formula
OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH