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