A process 2, wherein R1, {TAIL ~ R2} and {HEAD ~ R3} are hydrogen and R4 is a lower alkyl group 
A process 2 , wherein R1 , { TAIL ~ R2 } and { HEAD ~ R3 } are hydrogen and R4 is a lower alkyl group
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH