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