A compound 1 wherein {HEAD ~ R2} is alkyl and is selected from {TAIL ~ methyl}, ethyl, n propyl, iso propyl, n butyl, tert butyl, iso butyl and sec butyl 
A compound 1 wherein { HEAD ~ R2 } is alkyl and is selected from { TAIL ~ methyl } , ethyl , n propyl , iso propyl , n butyl , tert butyl , iso butyl and sec butyl
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH