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