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