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