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