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