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